Emission of phosphorescence from biacetyl surface by collision of N/sub 2/(A /sup 3/. sigma. /sup +//sub u/)

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

OSTI ID:6059591

Kume, H; Kondow, T; Kuchitsu, K

A supersonic beam of nitrogen molecules was excited to the A /sup 3/..sigma../sup +//sub u/ state by electron impact and was allowed to collide with a biacetyl surface cooled at 77 K. The spectrum of the emission from the surface observed in the 500-580 nm region was assigned to the phosphorescence of biacetyl. Its lifetime, 1.0 +- 0.1 ms, measured from the time dependence of the phosphorescence is found to be shorter than that measured by use of laser excitation (308 and 380 nm) from the same surface, 1.30 +- 0.02 ms. These results are interpreted by a mechanism of triplet-triplet energy transfer from N/sub 2/(A) (gas) to biacetyl (solid). The quantum yield of the phosphorescence is estimated to be about 1 x 10/sup -3/. The applicability of this method for detection of N/sub 2/(A) or other low-lying metastable states is discussed.

• Research Organization: Department of Chemistry, Faculty of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113
• OSTI ID: 6059591
• 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

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
BEAMS
COLLISIONS
EFFICIENCY
ELEMENTS
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
LUMINESCENCE
METASTABLE STATES
MOLECULAR BEAMS
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NITROGEN
NONMETALS
ORGANIC COMPOUNDS
PHOSPHORESCENCE
QUANTUM EFFICIENCY
SURFACES
TIME DEPENDENCE