Fine structure of 3s,3d: /sup 3/. sigma. , /sup 3/Pi, /sup 3/. delta. complex of H/sub 2/ by Doppler-free, laser spectroscopy

Journal Article · Sat Sep 15 04:00:00 EDT 1979 · J. Chem. Phys.; (United States)

OSTI ID:5965011

Lichten, W; Wik, T; Miller, T A

We have used the method of Doppler-free laser spectroscopy to resolve, for the first time, the fine structure of the H/sub 2/, 3s,3d complex: h (3s)/sup 3/..sigma../sub g//sup +/, g (3d)/sup 3/..sigma../sub g//sup +/, i (3d)/sup 3/Pi/sub g/, and j (3d)/sup 3/..delta../sub g/. A collimated beam of H/sub 2/ molecules in the metastable c /sup 3/Pi/sub u/ state was crossed with a tunable, dye laser beam. The absorbed light quenched the metastable molecules and changed the detected molecular beam intensity. The 3s,3d fine structure intervals have been measured to an accuracy of a few MHz (approx.0.0001 cm/sup -1/) for all of the rotational levels in the v=0, 1 levels, which are connected by allowed transitions to the N=2 rotational level of the c (2p)/sup 3/Pi/sub u/ state of parahydrogen. The fine structure constants of the N=1 rotational level of the i (3d)/sup 3/Pi/sub g//sup -/ state, extrapolated to the equilibrium internuclear separation are A/sup ..pi../+..gamma..=-145 +- 4MHz and B/sup ..pi..//sub 0/-..sqrt..6B/sup ..pi..//sub 2/=958 +- 13MHz and MHz. These results are discussed in terms of the transition from united to separated atom values. The remaining states are coupled to each other by configuration interaction and rotational interactions. By parametrizing such interactions, we find that an account of the fine structure of these states can be given by considering only interactions within the triplet 3s, 3d complex. With only one exception, interactions with states outside this complex do not have to be taken into account. This analysis gives values for 15 spin interaction constants.

• Research Organization: Becton Center, Yale University, New Haven, Connecticut 06520
• OSTI ID: 5965011
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 71:6; 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
ACCURACY
CRYOGENIC FLUIDS
D STATES
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FINE STRUCTURE
FLUIDS
HYDROGEN
LASER RADIATION
MOLECULES
NONMETALS
RADIATIONS
ROTATIONAL STATES
S STATES