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ARTICLES

Articles

•	Extreme ultraviolet spectra of highly ionized oxygen and fluorine D. J. Pegg, P. M. Griffin, H. H. Haselton, R. Laubert, J. R. Mowat, R. S. Thoe, R. S. Peterson, and I. A. Sellin pp. 745-748 [View Page Images , PDF (565 kB), or Buy this Article (Use Article Pack) ]

•	Radiative corrections to the decay rate of orthopositronium Michael A. Stroscio and John M. Holt pp. 749-755 [View Page Images , PDF (647 kB), or Buy this Article (Use Article Pack) ]

•	Long-range retarded intermolecular forces E. A. Power pp. 756-760 [View Page Images , PDF (496 kB), or Buy this Article (Use Article Pack) ]

•	Binding of positrons to atoms Sidney Golden and Irving R. Epstein pp. 761-768 [View Page Images , PDF (1106 kB), or Buy this Article (Use Article Pack) ]

•	Classical spectrum function for Coulomb interactions Alan Oppenheim pp. 769-773 [View Page Images , PDF (800 kB), or Buy this Article (Use Article Pack) ]

•	Excitation of Sn K- and L- and Ta L-shell x rays by 1.4-4.4-MeV protons K. Ishii, S. Morita, H. Tawara, H. Kaji, and T. Shiokawa pp. 774-780 [View Page Images , PDF (966 kB), or Buy this Article (Use Article Pack) ]

•	Scattering of two coherent beams by multiple centers Ming Chiang Li pp. 781-787 [View Page Images , PDF (1165 kB), or Buy this Article (Use Article Pack) ]

•	Rotational excitation of CH+ by electron impact Shih-I Chu and A. Dalgarno pp. 788-792 [View Page Images , PDF (452 kB), or Buy this Article (Use Article Pack) ]

•	Low-energy pair-production cross-section measurements for Z=50 F. T. Avignone and S. M. Blankenship pp. 793-796 [View Page Images , PDF (637 kB), or Buy this Article (Use Article Pack) ]

•	Formation of H(n=2) atoms by the nearly resonant process H+ in Cs. Multiple collision processes P. Pradel, F. Roussel, A. S. Schlachter, G. Spiess, and A. Valance pp. 797-812 [View Page Images , PDF (2737 kB), or Buy this Article (Use Article Pack) ]

•	Multiphoton ionization of cesium through resonant dissociative states of Cs2 C. B. Collins, B. W. Johnson, M. Y. Mirza, D. Popescu, and Iovitzu Popescu pp. 813-821 [View Page Images , PDF (1501 kB), or Buy this Article (Use Article Pack) ]

•	Small-angle scattering of metastable hydrogen formed by collisions of neutral hydrogen atoms with gas targets I. Sauers and E. W. Thomas pp. 822-828 [View Page Images , PDF (913 kB), or Buy this Article (Use Article Pack) ]

•	Stieltjes-integral approximations to photoabsorption and dispersion profiles in atomic helium P. W. Langhoff, J. Sims, and C. T. Corcoran pp. 829-841 [View Page Images , PDF (1938 kB), or Buy this Article (Use Article Pack) ]

•	Independent-particle-model study of electrons elastically scattering from oxygen G. J. Kutcher, P. P. Szydlik, and A. E. Green pp. 842-850 [View Page Images , PDF (1289 kB), or Buy this Article (Use Article Pack) ]

•	Microscopic calculation of the excitation spectrum of superfluid helium-4 Gerald W. Goble and Donald H. Kobe pp. 851-862 [View Page Images , PDF (1981 kB), or Buy this Article (Use Article Pack) ]

•	Parametric integral equation for radial distribution functions David D. Carley pp. 863-867 [View Page Images , PDF (652 kB), or Buy this Article (Use Article Pack) ]

•	Size measurement of positive impurity ions in liquid helium Warren W. Johnson and William I. Glaberson pp. 868-871 [View Page Images , PDF (462 kB), or Buy this Article (Use Article Pack) ]

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Dynamic properties of neutral excitations produced in electron-bombarded superfluid helium. I. The He(2 3S) and He2(a 3Σ) atomic and molecular metastable states J. W. Keto, F. J. Soley, M. Stockton, and W. A. Fitzsimmons pp. 872-886 [View Page Images , PDF (2444 kB), or Buy this Article (Use Article Pack) ]

•	Dynamic properties of neutral excitations produced in electron-bombarded superfluid helium. II. Afterglow fluorescence of excited helium molecules J. W. Keto, F. J. Soley, M. Stockton, and W. A. Fitzsimmons pp. 887-896 [View Page Images , PDF (1615 kB), or Buy this Article (Use Article Pack) ]

•	Free energy of a system of hard spherocylinders serving as a simple model for liquid crystals Robert L. Coldwell, Thomas P. Henry, and Chia-Wei Woo pp. 897-902 [View Page Images , PDF (903 kB), or Buy this Article (Use Article Pack) ]

•	Threshold conditions for amplified spontaneous emission of x radiation R. A. McCorkle and J. M. Joyce pp. 903-912 [View Page Images , PDF (1290 kB), or Buy this Article (Use Article Pack) ]

•	Intercollisional memory effects and short-time behavior of the velocity-autocorrelation function from translational spectra of liquid mixtures U. Buontempo, S. Cunsolo, and P. Dore pp. 913-921 [View Page Images , PDF (1374 kB), or Buy this Article (Use Article Pack) ]

•	Influence of negative-ion processes on steady-state properties and striations in molecular gas discharges William L. Nighan and W. J. Wiegand pp. 922-945 [View Page Images , PDF (4377 kB), or Buy this Article (Use Article Pack) ]

•	Study of the isotropic-nematic-solid transitions in a liquid crystal by carbon-13—proton double resonance A. Pines and J. J. Chang pp. 946-949 [View Page Images , PDF (540 kB), or Buy this Article (Use Article Pack) ]

•	Theory of two-photon Lamb dips Fujio Shimizu pp. 950-959 [View Page Images , PDF (1281 kB), or Buy this Article (Use Article Pack) ]

•	Experimental study of the reflection of phonons at an interface between dielectric crystals and liquid helium, gaseous helium, and solid neon Chorng-Jee Guo and Humphrey J. Maris pp. 960-966 [View Page Images , PDF (948 kB), or Buy this Article (Use Article Pack) ]

•	Correlation-function description of the ac orientational Kerr susceptibility of plastic crystals Eric Courtens pp. 967-977 [View Page Images , PDF (1704 kB), or Buy this Article (Use Article Pack) ]

•	Conduction regimes in expanded liquid mercury Morrel H. Cohen and Joshua Jortner pp. 978-996 [View Page Images , PDF (3598 kB), or Buy this Article (Use Article Pack) ]

COMMENTS

•	3P autoionization states of helium in the elastic-scattering region Kwong T. Chung and I-Hsiun Chen pp. 997-998 [View Page Images , PDF (192 kB), or Buy this Article (Use Article Pack) ]

•	Perturbation theory in self-induced transparency for short pulses Z. Bialynicka-Birula pp. 999-1002 [View Page Images , PDF (471 kB), or Buy this Article (Use Article Pack) ]

•	Comment on extraction of scattering information from Fredholm determinants calculated in an L2 basis P. L. Altick pp. 1003-1004 [View Page Images , PDF (278 kB), or Buy this Article (Use Article Pack) ]

•	K-vacancy production in symmetric heavy-ion collisions W. E. Meyerhof pp. 1005-1007 [View Page Images , PDF (599 kB), or Buy this Article (Use Article Pack) ]

•	Variational bounds on transition amplitudes David Storm pp. 1008-1009 [View Page Images , PDF (305 kB), or Buy this Article (Use Article Pack) ]

ERRATA

•	Erratum: New thermodynamic variables for a nonequilibrium system Aaron B. Corbet pp. 1010 [View Page Images or PDF (73 kB) ]

•	Erratum: Soft-mode dynamics in nematic liquid crystals R. Blinc, S. Lugomer, and B. Z̆eks̆ pp. 1010 [View Page Images or PDF (73 kB) ]

•	Erratum: Molecular hydrogen laser: 1098-1613 Å R. W. Dreyfus and R. T. Hodgson pp. 1010 [View Page Images or PDF (73 kB) ]