Laser-induced fluorescence spectroscopy of NCS in a free jet expansion

Journal Article · Sat Jul 15 04:00:00 EDT 1989 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.457128· OSTI ID:5898551

Northrup, F J; Sears, T J

Laser-induced fluorescence excitation spectra have been recorded for many vibronic transitions of the /ital A/(/sup 2//Pi/)--/ital X/(/sup 2//Pi/) and /ital B/(/sup 2//Sigma+/)--/ital X/(/sup 2//Pi/) systems of NCS under supersonic free jet expansion conditions. New assignments have been made for many of these bands and several of the assignments from previous work have been revised. Vibronic energies have been determined for levels involving excitation of all three vibrational modes in the ground electronic state and both excited electronic states. A detailed rotational and vibrational analysis has been carried out for levels involving excitations of the two stretching modes and the many rotational and potential function constants have been determined for the /ital A/ and /ital X/ states. The variation of the spin--orbit constant with vibrational level has also been investigated. Results of this paper provide the ground work for a detailed analysis of the Renner--Teller effect in the bending vibrational mode of this radical for both the /ital X//sup 2/(/Pi/) and /ital A/(/sup 2//Pi/) states to appear in a forthcoming paper. They also provide a spectroscopic database for future dynamical and kinetics studies of processes involving this radical.

• Research Organization: Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973(US)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5898551
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 91:2; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
ANTITHYROID DRUGS
CARBONIC ACID DERIVATIVES
COUPLING
DRUGS
EMISSION SPECTROSCOPY
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FERMI RESONANCE
FLUORESCENCE SPECTROSCOPY
HORMONE ANTAGONISTS
INTERMEDIATE COUPLING
L-S COUPLING
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
RADICALS
RESONANCE
ROTATIONAL STATES
SPECTRA
SPECTROSCOPY
THIOCYANATES
VIBRATIONAL STATES