INTERSYSTEM CROSSING IN PYRENE -h(10) AND PYRENE -d(10).

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Abstract:

The phosphorescence intensity, phosphorescence lifetime, and fluorescence lifetime of pyrene -h10 and pyrene -d10 were measured as functions of temperature from 80K to 300K. Using this data, we determine the temperature dependence of the rate constant for intersystem crossing. We find that there are two different routes for intersystem crossing from the lowest excited singlet state S1 to the lowest triplet state To. In addition to a thermally activated transition from S1 to the first excited triplet state T1, intersystem crossing occurs directly from S1 to To. Below 100K only the direct transition S1 to To can compete with the radiative decay of S1. Author

Author(s):
Jones, Peter F. ; Siegel, Seymour
Author Organization(s):
AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS
Descriptive Note:
Rept. for Mar-Aug 68,
Pagination:
0013

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-0200(9250-01)-2, SAMSO-TR-68-449
Contract/Grant Number(s):
F04701-68-C-0200
Monitor Series:
TR-68-449
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*PHOSPHORESCENCE, *POLYCYCLIC COMPOUNDS), (*FLUORESCENCE, POLYCYCLIC COMPOUNDS), AROMATIC COMPOUNDS, DYNAMICS, MOLECULAR ENERGY LEVELS
Field(s)/Group(s):
Radiation and Nuclear Chemistry
Keyword(s):
FLUORESCENCE LIFETIMES, INTERSYSTEM CROSSING, PYRENES, SINGLET ENERGY LEVELS, TRIPLET ENERGY LEVELS
Report Date:
1968 Oct 01