ULTRAVIOLET SPECTRA OF LiH AND LiD

Journal Article · Tue Oct 01 04:00:00 EDT 1957 · Canadian Journal of Physics (Canada)

DOI:https://doi.org/10.1139/p57-129· OSTI ID:4352978

Velasco, R

The absorption spectra of LiH and LiD have been observed in the near ultraviolet with high dispersion and absorbing path lengths up to 16 meters. A new band system has been found in each molecule involving the ground state and a / sup 1/II excited state. Rotational and vibrational analyses of this system have been carried out and rotational and vibrational constants for the upper state have been determined. The observed breaking off of the rotational structure of the bands of this B /sup 1/II-X /sup 1/ SIGMA /sup +/ system has been interpreted as due to predissociation by rotation. With this assumption very accurate dissociation limits of the B /sup 1/II state have been obtained. From these dissociation limits the dissociation energies of the three known electronic states of LiH and LiD have been calculated. In particular the dissociation energies (D/sup 0/) of the ground states of LiH and LiD have been found to be 2.4288 plus or minus 0.0002 ev and 2.4509 plus or minus 0.0010 ev, respectively. (auth)

• Research Organization: National Research Council, Ottawa, Can.
• Sponsoring Organization: USDOE
• NSA Number: NSA-12-000682
• OSTI ID: 4352978
• Journal Information: Canadian Journal of Physics (Canada), Journal Name: Canadian Journal of Physics (Canada) Vol. Vol: 35; ISSN CJPHA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
CONFIGURATION
DECOMPOSITION
DEUTERIUM COMPOUNDS
DIFFRACTION
ENERGY
ENERGY LEVELS
EXCITATION
LITHIUM COMPOUNDS
LITHIUM HYDRIDES
MOLECULES
NUMERICALS
OSCILLATIONS
PHYSICS
PREDISSOCIATION
ROTATIONAL CONSTANTS
SPECTRA
SPECTROSCOPY
TRANSIENTS
ULTRAVIOLET RADIATION