Hexadecapolar U-branch transitions in the infrared fundamental band of gaseous hydrogen at 77 K

Journal Article · Sun Jun 01 04:00:00 EDT 1980 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.439066· OSTI ID:5338303

Reddy, S P; Sen, A; Prasad, R D.G.

U-branch transitions corresponding to the rotational selection rule ..delta..J=+4 in the collision-induced fundamental band of normal H/sub 2/ at 77 K have been investigated for gas densities in the range 300--520 amagat with a 2 m absorption cell. These transitions, arising from the hexadecapolar induction mechanism in the colliding pairs of molecules, occur in the high wave number tail of the overlap and quadrupolar transitions of the band and include primarily single transitions U/sub 1/(J) and double transitions Q/sub 1/(J)+U/sub 0/(J), J=0 and 1, at 77 K. The experimental absorption profiles were analyzed by assuming a new expression for the contribution of the total wing of the overlap and quadrupolar transitions and a dispersion type function as well as a Levine--Birnbaum function for the U transitions, and the characteristic half-width parameters delta/sub u/ of the dispersion function and delta'/sub u/ of the Levine--Birnbaum function have been obtained. The experimental value of the binary absorption coefficient of the U/sub 1/(1) transition, derived from the profile analysis, is 2.40 x 10/sup -10/ cm/sup -1/ amagat/sup -2/, which is in good agreement with the theoretical value.

• Research Organization: Memorial University of Newfoundland, St. John's, Newfoundland, Canada A1B 3X7
• OSTI ID: 5338303
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 72:11; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
CRYOGENIC FLUIDS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUIDS
HYDROGEN
INFRARED SPECTRA
LINE WIDTHS
LOW TEMPERATURE
NONMETALS
ROTATIONAL STATES
SPECTRA