Search Results (99 total)

A new high-temperature millimeter-wave microwave spectrometer has been constructed and used to measure a wide range of vibrational and rotational states of silicon monoxide. This work results in accurate rest frequencies for all of the intersteller SiO maser transitions that have been observed as well as accurate measurements or predictions of all transitions that are likely to be of astrophysical interest. In addition, the Dunham spectral and potential constants are calculated for the three major isotopic species. For ²⁸Si¹⁶O: Y₀₁=21 787.453(11) MHz, Y₁₁=-151.026(11) MHz, Y₂₁=70.5(24) kHz, Y₀₂=-29.38(13) kHz, a₀=5.390(22)×10⁵ cm^-1, a₁=-2.9899(41), a₂=5.7(7), a₃=-9.0(5). The calculated equilibrium parameters for ²⁸Si¹⁶O are B_e=21 787.5(10) MHz, ω_e=1252.(3) cm^-1, ω_ex_e=5.96(71) cm^-1, and r_e=1.509 73(4) Å.

Measurements of millimeter-wave fine-structure transitions and the n(J)=0(1)→2(1) rotational transition of ¹⁶O ¹⁸O have been made with high precision. From analysis of the results the following molecular constants of ¹⁶O ¹⁸O were obtained: B₀=40 707.408(10) MHz, B₁=-0.129 MHz, λ₀=59 499.097(43) MHz, λ₁=0.053 12(80) MHz, μ₀=-238.488(7) MHz, μ₁=-0.000 619(116) MHz, B_e=40 931.7(6.9) MHz, r₀=1.210 751(16) Å, and r_e=1.207 429(103) Å. The equilibrium values were obtained with the aid of vibration-rotation interaction constants from optical spectroscopy.

The rotational spectrum of DTO and HTO in the ground vibrational state has been measured with high-resolution microwave techniques in the 50-700-GHz region. We have measured and assigned 41 transitions of DTO. Analysis of these data yielded the following rotation and distortion parameters of the Watson formulation (in MHz): A=410 174.145±0.078, B=172 101.952±0.045, C=199 127.850±0.045, Δ_J=5.199034±0.003, Δ_JK=-15.50411±0.015, Δ_K=180.31052±0.010, δ_J=1.941256±0.0010, δ_K=12.8893±0.012. We measured 22 previously undetected transitions of HTO. Analysis of these, together with 26 lines already known, gave the following rotation and distortion parameters (in MHz): A=677 849.040±0.170, B=198 197.489±0.128, C=150 462.412±0.128, Δ_J=5.212023±0.003, Δ_JK=48.52276±0.02, Δ_K=271.27533±0.06, δ_J=1.414126±0.0005, δ_K=51.32833±0.07. The usual distortion-free rotational constants derived from these Watson constants are (in MHz): for DTO, A^′=410 160.3, B^′=172 050.2, C^′=119 183.6; and for HTO, A^′=677 777.7, B^′=198 089.7, C^′=150 604.4. The latter constants and corresponding ones previously obtained for other isotopic species of water were used to calculate substitutional structures of the molecule. The averages of the structural parameters thus obtained are 0.9577 Å for the bond length and 104.66° for the bond angle.

The rotation-inversion spectrum of ¹⁴NT₃ in the ground vibrational state has been measured with high-resolution microwave techniques in the frequency range of 210-633 GHz. Components of the J=0→1, 1→2, and 2→3 transitions were observed. Analysis of the results yielded the following rotational constants: B₀=105565.373±0.034 MHz, D_J=2.5981±0.0024 MHz, and D_{J K}=-4.472±0.006 MHz, with the ¹⁴N nuclear quadrupole coupling e q Q=-4.170±0.049 MHz. The inversion frequency, corrected for rotational distortion, was found to be 305.89 ± 0.11 MHz. Molecular substitution structures obtained were bond length 1.0132 ÅA and bond angle 107° 13' for the combination ¹⁴NH₃: ¹⁵NH₃, ¹⁴NT₃; bond length 1.0128 ÅA and bond angle 107° 2' for the combination ¹⁴ND₃: ¹⁵ND₃, ¹⁴NT₃.

The rotational spectrum of T₂O in the ground vibrational state has been measured with high-resolution microwave techniques in the 80-640-GHz region. Forty-six previously unreported transitions have been measured and assigned. Analysis of these results and the six previously observed lines yielded the following rotation and distortion parameters (in MHz) of the Watson formulation: A=338 810.923±0.076, B=145 665.417±0.044, C=100 259.415±0.044, Δ_J=4.145597±0.0014, Δ_JK=-22.03898±0.008, Δ_K=144.13766±0.006, δ_J=1.609823±0.0008, and δ_K=5.44092±0.01. The usual distortion-free rotational constants derived from these are (in MHz) A^′=338 808.0, B^′=145 631.9, and C^′=100 291.9. The effective ground-state structures obtained for T₂O are 0.9623 Å for the bond length and 104.6° for the bond angle. The observed inertial defect Δ=0.0772 amu Ų agrees well with the theoretically derived value of 0.0753 amu Ų.

Fine-structure transitions in the millimeter wavelength region and the n(J)=1(2)→3(2) submillimeter wavelength rotational transition have been measured with high precision. The submillimeter radiation was generated by a harmonic multiplier and detected by a silicon bolometer operated at 1.5 °K. The measured 1(2) → 3(2) frequency of ¹⁸O₂ is 378 831.51(20) MHz. A remeasurement of the 1(2) → 3(2) frequency for ¹⁶O₂ yielded the value 424 763.12(10) MHz. Analysis of the results yielded the following values of the molecular constants for ¹⁸O₂: B₀=38 313.721(2) MHz, λ₀=59 496.708(12) MHz, λ₁=0.0521(3) MHz, μ₀=-224.438(3), μ₁=-0.000 29(5) MHz, B_e=38 518.6(6.3) MHz, and r_e=1.20 743(10) Å. The values agree well with those predicted from isotopic corrections of the ¹⁶O₂ values. The equilibrium constants were obtained with the aid of vibration-rotation interaction constants from optical spectroscopy.

The rotational spectrum of H₂¹⁸O in the ground vibrational state has been investigated by means of high-resolution microwave spectroscopy. We report the measurement of ten new rotational transitions in the 1.0- to 0.4-mm wavelength region. Among these are several low-J lines which are of significance in the atmospheric absorption of electromagnetic radiation in the microwave region. The frequencies of newly observed transitions are (in MHz); 5_1,5←4_2,2, 322 465.17; 4_1,4←3_2,1, 390 607.76; 4_2,3←3_3,0, 489 054.26; 6_2,4←7_1,7, 517181.96; 6_4,3←5_5,0, 520 137.32; 5_3,3←4_4,0, 537 337.57; 1_1,0←1_0,1, 547 676.44; 6_4,2←5_5,1, 554 859.87; 5_3,2←4_4,1, 692 079.14; and 2_1,1←2_0,2, 745 320.20. Assignments were based on a weighted analysis of combined microwave and infrared data.

The absorption spectrum of water vapor, in addition to giving information about the structure and properties of the water molecule, is of practical importance because of the effects of water vapor on the propagation of electromagnetic radiation. However, precise measurements of only 6 ground-vibrational-state transitions of H₂¹⁶O have been reported in the microwave region. We report the measurement of nine new rotational transitions of H₂¹⁶O and the remeasurement to higher accuracy of the four previously known submillimeter lines. The frequencies of the newly observed transitions are (in Mc/sec) 10_2,9←9_3,6, 321225.644; 7_5,3←6_6,0, 437346.667; 6_4,3←5_5,0, 439150.812; 7_5,2←6_6,1, 443018.295; 6_4,2←5_5,1, 470888.947; 5_3,3←4_4,0, 474689.127; 6_2,4←7_1,7, 488491.133; 5_3,2←4_4,1, 620700.807; and 2_1,1←2_0,2, 752033.227. These transitions have been measured with a submillimeter-wave spectrometer which employs a klystron-driven crystal harmonic generator and a 1.6°K InSb photoconducting detector. With this work, the lines contributing the major portion of the atmospheric absorption of water vapor in the region up to 800 Gc/sec have been precisely measured.

Rotational transitions of a number of isotopic species of the hydrogen halides have been measured in the 1.0- to 0.38-mm wavelength region of the spectrum. These transitions have been measured with a submillimeter-wave spectrometer which employs a klystron-driven crystal harmonic generator and a 1.6°K InSb photoconducting detector. The following results have been obtained: for H ³⁵Cl, B₀=312 989.297±0.020 Mc/sec, D₀=15.836 Mc/sec, r_e=1.274 5991 Å; for H ³⁷Cl, B₀=312 519.121±0.020 Mc/sec, D₀=15.788 Mc/sec, r_e=1.274 5990 Å; for D ³⁵Cl, B₀=161 656.238±0.014 Mc/sec, D₀=4.196±0.003 Mc/sec, r_e=1.274 5990 Å; for D ³⁷Cl, B₀=161 183.122±0.016 Mc/sec, D₀=4.162±0.003 Mc/sec, r_e=1.274 5988 Å; for H ¹²⁷I, B₀=192 657.577±0.019 Mc/sec, D₀=6.203±0.003 Mc/sec, r_e=1.609 018 Å; for D ¹²⁷I, B₀=97 537.092±0.009 Mc/sec, D₀=1.578±0.001 Mc/sec, r_e=1.609 018 Å; for D ⁷⁹Br, B₀=127 357.639±0.012 Mc/sec, D₀=2.6529±0.0014 Mc/sec, r_e=1.414 4698 Å; for D ⁸¹Br, B₀=127 279.757±0.017 Mc/sec, D₀=2.6479±0.0020 Mc/sec, r_e=1.414 4698 Å; for D ¹⁹F, B₀=325 584.98±0.300 Mc/sec, D₀=17.64 Mc/sec, r_e=0.916 914 Å.

Millimeter and submillimeter wave rotational transitions have been measured for different isotopic species of arsine and stibine from which accurate values of the rotational constants, including centrifugal stretching constants, nuclear quadruple and nuclear magnetic coupling constants, were obtained. Results (in Mc/sec) are for ⁷⁵AsH₃, B₀=112 470.59±0.03, D_J=2.925±0.003, D_JK=-3.718±0.004, eqQ=-162.63±0.03, C_N=0.106±0.003, C_K=0.028±0.014; for ⁷⁵AsD₃, B₀=57 477.60±0.02, D_J=0.741±0.002, D_JK=-0.928±0.003, eqQ=-164.75±0.03, C_N=0.051±0.003, C_K=0.069±0.015; for ¹²¹SbH₃, B₀=88 038.99±0.03, D_J=1.884±0.004, D_JK=-2.394±0.015, eqQ=460.31±0.10, C_N=0.245±0.006, C_K=0.247±0.030; for ¹²³SbH₃, B₀=88 022.51±0.03, D_J=1.884±0.004, D_JK=-2.365±0.015, eqQ=586.65±0.11, C_N=0.130±0.005, C_K=0.165±0.030; for ¹²¹SbD₃, B₀=44 694.92±0.03, D_J=0.473±0.004, D_JK=-0.598±0.009, eqQ=465.32±0.10, C_N=0.127±0.006, C_K=0.162±0.030; for ¹²³SbD₃, B₀=44 678.81±0.03, D_J=0.476±0.004, D_JK=-0.589±0.010, eqQ=593.06±0.11, C_N=0.063±0.005, C_K=0.044±0.030.

High-resolution sweep spectroscopy has been extended to submillimeter wavelengths as short as 0.37 mm. The sensitivity of microwave spectroscopy in the submillimeter region (0.37 to 1 mm) has been improved by more than an order of magnitude. The highest-frequency spectral lines measured are the J=6→7 transition of ¹²C¹⁶O at 806 651.719 MHz and the J=66→67 transition of ¹⁶O¹²C³²S at 813 353.706 MHz. The rotational constant B₀ for DF is observed to be 325 584.96 MHz.

Rotational transitions of different isotopic species of ammonia and phosphine have been observed in the ½- to 1-mm region. The frequency of the J=0→1 transition of ¹⁴NH₃ is 572 496.69 ± 0.60 Mc/sec and that for ¹⁵NH₃ is 572 053.18 ± 0.50 Mc/sec. Spectral constants B₀ observed for the different isotopic species (in Mc/sec) are: 298 114.68 for ¹⁴NH₃, 297 359.32 for ¹⁵NH₃, 154 173.25 for ¹⁴ND₃, and 153 600.82 for ¹⁵ND₃. Structural dimensions for the ground vibrational state of ammonia obtained by isotopic substitution are 1.0136 Å for the bond length and 107°3' for the bond angle. For PH₃, the rotational constants obtained (in Mc/sec) are: B₀=133 480.15, D_J=3.95, and D_JK=-5.18; for PD₃ they are B₀=69 471.09, D_J=1.02, and D_JK=-1.31. An upper limit of ½ Mc has been put on the unknown inversion frequency of PH₃.

A millimeter-wave molecular-beam maser has been made to operate as both an amplifier and an oscillator on the J=1→0 and the J=2→1 transitions of HCN at 88.6 and at 177.2 kMc/sec, respectively, thus doubling the previously operational frequency range of such masers. With this maser, hyperfine components of these transitions have been measured for H¹²C¹⁴N and D¹²C¹⁴N to nine significant figures. The spectral constants (in kc/sec) that are derived from these frequencies are, for HCN, B₀=44 315 975.7±0.4, D_J=87.24±0.06, (eQq)_N=-4709.1±1.3, and C_N=10.4±0.3; for D¹²C¹⁴N, B₀=36 207 462.7±0.2, D_J=57.83±0.04, (eQq)_N=-4703.0±1.2, C_N=8.4±0.3, (eQq)_D=194.4±2.2, and C_D=-0.6±0.3.

The J=0→1 rotational line of LiD has been measured in the ground vibrational state and in the first excited state. The measurements have provided values of the frequencies and the spectral constants. ν₀ (Mc/sec) ν₁ (M̀c/sec) Y₀₁ (Mc/sec) Y₁₁ (Mc/sec) B_e (Mc/sec) ⁶LiD 260 306.96 ± 0.05 254 596.63 ± 0.05 131 615.07 ± 0.04 -2898.90 ±0.04 131 673 ± 4 ⁷LiD 251 043.53 ± 0.05 245 635.62 ± 0.05 126 905.36 ± 0.04 2744.61 ± 0.04 126 961 ± 4 The value of r_e, which is independent of isotopic substitution, is found to be 1.594 90 ± 0.000 02 Å. From these constants the corresponding values for the LiH species are derived.

High-precision measurements of many millimeter- and submillimeter-wave rotational lines of different isotopic species of lithium fluoride and chloride in four different vibrational states have provided accurate evaluation of their rotational, vibrational, and potential constants. The resulting values are: Y₀₁ Y₁₁ Y₀₂ r_e ω_e ω_ex_e (Mc/sec) (Mc/sec) (kc/sec) (Å) (cm^-1) (cm^-1) ⁶Li¹⁹F 45 230.848 722.417 442.95 1.563 857 964.24 9.136 ⁷Li¹⁹F 40 329.808 608.182 352.36 1.563 857 910.25 8.104 ⁶Li³⁵Cl 24 116.578 291.760 132.56 2.020 671 686.23 5.096 ⁶Li³⁷Cl 23 925.383 288.305 130.42 2.020 671 683.64 5.084 ⁷Li³⁵Cl 21 181.004 240.122 102.19 2.020 671 643.31 4.501 ⁷Li³⁷Cl 20 989.825 236.894 100.41 2.020 671 640.22 4.490 B_e=h / 8π²μr_e² is shown to differ from the observed value Y₀₁ because of small isotopic effects.

The submillimeter-wave rotational transition N=1→3, J=2→2 of oxygen has been measured at a frequency of 424 763.80 ± 0.20 Mc/sec. The millimeter-wave fine-structure frequencies for the N=1 and N=3 states have been remeasured with high precision. From the results the rotational constant of oxygen B₀=43 100.589±0.022 Mc/sec has been derived.

Electron-spin-resonance spectra of N, P, As, and H atoms trapped in matrices formed from rare-gas elements at 4.2°K have been studied. The isotropic hyperfine coupling of N and P increases with the atomic number of the matrix element whereas that of As decreases. The van der Waals interaction theory devised by Adrian to explain the matrix effects on the nitrogen hyperfine splitting was generalized and applied with good success to the heavier group-V atoms. The results indicate that these group-V atoms occupy substitutional lattice sites, whereas the H atoms occupy octahedral sites. Recalculation of the matrix perturbations on nitrogen with more recent analytical self-consistent-field wave functions significantly improved agreement between theory and experiment. The isotropic g factor of N, P, and As was found to be less than the free-spin g and to decrease with increasing atomic number of the matrix elements. A weak fine structure observed for As atoms trapped in the Kr matrix is attributed to a small fraction of the atoms trapped in crystalline faults in the matrix.

The electron-spin-resonance spectra of molecular free radicals formed from the group-IV and group-V hydrides at 4.2°K in the xenon matrix have been observed and compared with those observed in krypton and other matrices. From these spectra, certain properties of the free radicals and certain matrix effects have been derived. Molecular free radicals formed by γ irradiation of a matrix containing PH₃ or AsH₃ are PH₂ and AsH₂, respectively. From analysis of the hyperfine structure, the P-bonding orbitals of PH₂ were found to have 20.6% 3s character in the Xe matrix, compared with 19% in the Kr matrix. Because of anisotropies in the coupling and in the g tensor the hyperfine structure of AsH₂ could not be measured. In the Xe matrix the average g is 2.0050 for PH₂, and 2.034 for AsH₂. No spectra could be observed for SbH₂, although evidence for dissociation of SbH₂ was indicated by the strong H-atom lines observed for a γ-irradiated sample of SbH₃ in the Xe matrix. Molecular free radicals formed by γ irradiation of the group-IV hydrides are CH₃, SiH₃, GeH₃, and SnH₃. The observed hyperfine structure caused by the isotopes ²⁹Si, ⁷³Ge, and ^117,119Sn indicate that the radicals SiH₃, GeH₃, and SnH₃ are not planar like CH₃, but are pyramidal in structure. Noticeable difference in the isotropic coupling of ²⁹Si for the Kr matrix, 240 G, and for the Xe matrix, 190 G, indicates strong interaction of the matrix with the SiH₃ radicals.

A new type of high-temperature spectrometer for operation in the millimeter- and submillimeter-wave regions has been constructed and used for measurements of numerous rotational transitions of AgCl at 750°C. Significant improvement in sensitivity over other high-temperature spectrometers operating in the submillimeter region has been achieved. With it, rotational lines of AgCl up to a frequency of 366 858.51 Mc/sec (λ=0.8 mm) have been measured with high precision. The molecular constants obtained are. For Ag¹⁰⁷Cl³⁵, B_e=3686.9639 Mc/sec, α_e=17.8498 Mc/sec, γ_e=0.01883 Mc/sec, D_e=1.8903 kc/sec, ω_e=343.52 cm^-1, ω_ex_e=1.169 cm^-1, r_e=2.28078 Å; for Ag¹⁰⁹Cl³⁵, B_e=3670.2777 Mc/sec, α_e=17.7284 Mc/sec, γ_e=0.01859 Mc/sec, D_e=1.8739 kc/sec, ω_e=342.68 cm^-1, ω_ex_e=1.163 cm^-1, r_e=2.280779 Å; for Ag¹⁰⁷Cl³⁷, B_e=3536.8734, α_e=16.7705 Mc/sec, γ_e=0.01708 Mc/sec, D_e=1.7383 kc/sec, ω_e=336.58 cm^-1, ω_ex_e=1.118 cm^-1, r_e=2.280781 Å; for Ag¹⁰⁹Cl³⁷, B_e=3520.1846 Mc/sec, α_e=16.6520 Mc/sec, γ_e=0.01710 Mc/sec, D_e=1.7192 kc/sec, ω_e=336.04 cm^-1, ω_ex_e=1.121 cm^-1, r_e=2.280782.

The electron spin resonance of paramagnetic species produced by γ irradiation of solid methane at 4.2°K has been observed. In addition to the expected signals from individual H and CH₃ radicals, weaker signals from exchange-coupled H and CH₃ radicals were observed. The exchange interaction is isotropic, but there is an anisotropic dipole-dipole interaction between the aligned electron spin moments which gives rise to a splitting of 91 G. Analysis of this interaction indicates the separation of the coupled H and CH₃ to be 6.76 Å. The hyperfine splitting by the H is 255 G and that by each proton of the CH₃ group is 11.5 G, or one-half those for the isolated H and CH₃. These features are shown to be in agreement with theoretical predictions. Similar effects were observed for CH₄ irradiated in a krypton matrix at 4.2°K.

Rotational transitions of the alkali metal fluorides CsF, Rb⁸⁷F, Rb⁸⁵F, K³⁹F, NaF, and Li⁷F have been measured in the millimeter- and submillimeter-wave regions where no previous measurements existed. The work was accomplished with a high-resolution molecular-beam absorption spectrometer, previously utilized for study of the other alkali halides. A more reliable oven was constructed and used to vaporize the alkali fluorides at temperatures up to 1100°C. Measurements on rotational transitions as high as J=27→28 in the first three vibrational states gave Y₀₁, Y₁₁, and Y₂₁ more accurately, for the most part, than they were previously known, and gave Y₀₂ and Y₁₂ for the first time. From these Dunham rotational constants were derived potential coefficients, moments of inertia, internuclear distances, and vibrational constants.

The J=0→1 transitions of HCl and HBr have been measured in the wavelength regions of 0.59 and 0.48 mm, respectively. These measurements led to the following values of molecular constants: for HCl³⁵, ν₀=625 919.24±0.52 Mc/sec, eQq=63.0±2.8 Mc/sec, C_I≈0, B₀=312 991.30±0.26 Mc/sec, B_e=317 587 Mc/sec, r₀=1.2838₇ Å, r_e=1.2745₅ Å; for HBr⁷⁹, ν₀=500 675.24±0.52 Mc/sec, eQq=535.4±1.4 Mc/sec, C_I=0.29±0.20 Mc/sec, B₀=250 360.78±0.13 Mc/sec, B_e=253 790 Mc/sec, r₀=1.4243₉ Å, r_e=1.4146₀Å; and for HBr⁸¹, ν₀=500 519.41±0.26 Mc/sec, eQq=447.9±1.4 Mc/sec, C_I=0.31±0.20 Mc/sec, B₀=250 282.88±0.13 Mc/sec, B_e=253 710 Mc/sec, r₀=1.4140₂ Å, r_e=1.4146₀ Å.

Energy migration to impurity molecules of hydrogen and methane trapped in solid matrices of argon and krypton at low temperature is shown to occur. The solid containing the impurity molecules in minute quantities was irradiated at 4.2°K with γ rays from Co⁶⁰, and the free radicals produced by dissociation of impurity molecules were measured from the intensity of their electron spin resonance signals. For concentrations of 0.001 mole fraction of CD₄ in A or Kr, over 500 times as many molecules of CD₄ were dissociated as would be expected from the same quantity of pure CD₄ given the same exposure dose. It is concluded that the dissociation of the dilute impurity is produced almost wholly by the energy absorbed by the matrix and transferred to the impurity molecules. In the mixed isotopic species—HCD₃, H₂CD₂, and H₃CD—it is shown from the relative strength of the ESR signals of H and D atoms that the C-H bond has about 5 times greater probability of being broken by the migrating energy than has a given C-D in the same molecule. This large isotopic effect is attributed to the more rapid escape of H over D from the parent molecule within the lattice.

The methods of high-resolution microwave spectroscopy have been extended to λ=0.43 mm. The J=5→6 rotational line of C¹²O¹⁶ has been measured to be 691 472.60±0.60 Mc/sec. With other measured lower frequency transitions, this value leads to a centrifugal stretching constant D₀=0.18390±0.00014 Mc/sec and to B₀=57 635.970±0.003 Mc/sec for C¹²O¹⁶. Measurements of the three hyperfine components of the J=0→1 transition of HCl³⁵ at λ=0.48 mm yield for this molecule ν₀=625 919.24±0.52 Mc/sec and B₀=312 991.30±0.26 Mc/sec. With the infrared value of B₀ in wavelength units measured with great accuracy by Rank and his associates, our B₀ value yields the spectral value c=299 792.8±0.4 km/sec for the velocity of light. This value is in agreement with, and is of comparable accuracy to, the best values obtained by other more direct methods for the measurement of c.

The pure rotational spectra of the alkali chlorides were investigated in the 0.96- to 3-mm range of the microwave region with the molecular-beam spectrometer earlier developed at Duke University. Introduction of Teflon microwave lenses and high-pass microwave filters improved this spectrometer so that measurements into the submillimeter region were possible, to an accuracy of better than one part in 10⁶. Dunham's solution for the diatomic molecule was applied in interpretation of data. Improved values for B_e, α_e, and γ_e were obtained for most molecules studied. The centrifugal distortion constants D_e and β_e were obtained from the rotational spectra for the first time for all molecules measured. From the latter two constants, accurate values of ω_e and ω_ex_e were derived. Other derived quantities are: potential coefficients, isotopic mass ratios, moments of inertia, and internuclear distances. For most of these quantities, the accuracies obtained surpass those from previous measurements.