STUDY OF HELIUM MOLECULAR SPECTRA.

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Abstract:

A detailed interpretation is presented of the measured ultraviolet absorption and emission spectra of the helium molecule. A potential-energy curve is derived for the A singlet Sigmau state that has a potential barrier of height 0.049 eV at a separation of 3.1 A and a potential well of depth 2.50 eV at a separation of 1.04 A. It is argued that the emission spectrum is due primarily to quasi-bound resonating vibrational states. Quantitative values for the absorption coefficient of colliding helium atoms are given. Some calculations on the effect of shape resonances in the photodissociation of H2 are described. An investigation of the effects of centrifugal distortion on discrete transition probabilities in the Lyman system of H2 is reported. Author

Author(s):
Dalgarno, Alex ; Sando, Kenneth M. ; Allison, Arthur C.
Author Organization(s):
SMITHSONIAN ASTROPHYSICAL OBSERVATORY CAMBRIDGE MASS
Descriptive Note:
Final rept. 29 Jan 69-31 Jan 70,
Pagination:
0066

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFCRL-70-0249
Contract/Grant Number(s):
F19628-68-C-0234
Task Number(s):
862706
Project Number(s):
AF-8627
Monitor Series:
70-0249
 Subject Terms
Joint Capability Areas:
JCA_6.3.3_Spectrum Management; JCA_6.3_Net Management; JCA_6_Net Centric
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*HELIUM, *ULTRAVIOLET SPECTRA, *HYDROGEN, *DISSOCIATION, ABSORPTION SPECTRA, ELECTRON TRANSITIONS, MOLECULAR ORBITALS, VIBRATION, POTENTIAL ENERGY, LINE SPECTRA, LINE SPECTRA
Field(s)/Group(s):
Atomic and Molecular Physics and Spectroscopy
Keyword(s):
EMISSION SPECTRA
Report Date:
1970 Apr 01