Metastable hydrogen molecules. IV. Vibrational analysis and spin--rotation interaction

Journal Article · Fri Dec 15 04:00:00 EST 1978 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.436533· OSTI ID:6580811

Lichten, W; Wik, T

This paper presents new experimental data which improves by an order of magnitude the precision of our understanding of the fine structure of the hydrogen molecule. By means of the molecular beam, magnetic resonance method, we find that the v=0, 1, and 2 vibrational levels of parahydrogen in the c /sup 3/Pi/sub u/ state are metastable. Measurements of four fs intervals in the N=2 rotational level of these three vibrational levels complete the set of six such measurements. In addition, we report eleven more intervals in the N=1 rotational level of the v=1 vibrational state, to comple the 13 possible measurements in that state. The four fine structure constants, including the spin-rotation constant C, are determined for all the v=0 and v=1, N=1, and N=2 levels. The linear combinations of constants, A+5C and B/sub 0/+..sqrt..6 B/sub 2/, are found for N=2, v=2 also. Completion of vibrational assignments and inclusion of spin-rotation interaction now makes experimentally determined constants interpretable to a fraction of a percent in most cases. A method is given for using spectroscopic constants to find the vibrational average of an operator.

• Research Organization: Becton Center, Yale University, New Haven, Connecticut 06520
• OSTI ID: 6580811
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 69:12; 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
CRYOGENIC FLUIDS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FINE STRUCTURE
FLUIDS
HYDROGEN
METASTABLE STATES
NONMETALS
ROTATIONAL STATES
SPECTRA
VIBRATIONAL STATES