Fluorescence lifetimes and Zeeman quantum beats of single rotational levels in /sup 3/B/sub 2/ carbon disulfide

Journal Article · Tue Apr 01 04:00:00 EST 1986 · J. Chem. Phys.; (United States)

OSTI ID:6098334

Loge, G W; Tiee, J J; Wampler, F B

The lowest observed triplet state of carbon disulfide, the R /sup 3/B/sub 2/ state, was directly excited using a pulsed, narrow bandwidth dye laser (0.05 cm/sup -1/). The first reported collision-free lifetimes of this state of CS/sub 2/ were obtained, and the changes in lifetime for single rotational and vibrational levels were observed. The effect of rotation and vibration on the lifetimes indicates that the R /sup 3/B/sub 2/ state has strong spin-orbital coupling with the higher lying V /sup 1/B/sub 2/ state, which gives the R /sup 3/B/sub 2/ state such short lifetimes (2--5 ..mu..s) for a triplet state. A magnetic field was observed to have no effect on the lifetimes, which is consistent with this strong spin-orbital coupling scheme. Zeeman quantum beats were observed on the fluoresence decay curves in a magnetic field. Beat frequencies were obtained as a function of magnetic field strength to obtain permanent magnetic dipole moments for the R /sup 3/B/sub 2/ state vibrational levels. The magnetic dipole moments were found to be independent of rotational angular momentum (N dependence) indicating a strong spin-orbital coupling, consistent with the lifetime data. The collisional depolarization rate was qualitatively observed to be competitive with and slightly faster than electronic quenching.

• Research Organization: Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
• OSTI ID: 6098334
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 84:7; 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
CARBON COMPOUNDS
CARBON SULFIDES
CHALCOGENIDES
ELECTRONIC STRUCTURE
ENERGY LEVELS
EXCITED STATES
FLUORESCENCE
LIFETIME
LUMINESCENCE
MAGNETIC FIELDS
ROTATIONAL STATES
SULFIDES
SULFUR COMPOUNDS
ZEEMAN EFFECT