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Lithium Hydrides and Lithium Dimers: Sub‐Doppler Spectroscopy and Dynamics
Author(s) -
Bouloufa N.,
Cacciani P.,
Jeung G.H.,
Vetter R.
Publication year - 2002
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200200073
Subject(s) - chemistry , isotopomers , excited state , dissociation (chemistry) , spectroscopy , lithium (medication) , atomic physics , rydberg formula , molecule , ionization , ion , physics , endocrinology , medicine , organic chemistry , quantum mechanics
Deep insights into molecular structures and dynamics were obtained for lithium dimers and lithium hydrides by sub‐Doppler spectroscopy combining molecular beams and cw tunable laser beams. For 7 Li 7 Li species, accurate spectroscopic studies of the B 1 Π u ‐X 1 Σ g + system were carried out, with the measurement of hundreds of wave numbers and with the determination of dissociation rates due to tunneling through the potential barrier of the B 1 π u state. They led to the full description of the B state potential, including its barrier. For 6 Li 7 Li species, weak but non‐negligible dissociation rates in the B 1 Π u state were observed, measured and interpreted assuming that an electronic coupling between the B 1 Π u and 1 1 Π g states takes place through an ungerade ‐ gerade symmetry breaking. For LiH species, the A 1 Σ + ‐X 1 Σ + system was revisited for both isotopomers. For this molecule, dynamical effects are predicted in highly‐excited Rydberg states, that could be studied by use of similar sub‐Doppler techniques.