A NOVEL FIBER-OPTIC-BASED PUMP-PROBE INSTRUMENT FOR THE ACQUISITION OF KINETIC INFORMATION

被引:2
作者
CARROLL, MK [1 ]
HIEFTJE, GM [1 ]
机构
[1] INDIANA UNIV,DEPT CHEM,BLOOMINGTON,IN 47405
关键词
PUMP-PROBE SPECTROSCOPY; INSTRUMENTATION; FIBER OPTICS; INTERSYSTEM CROSSING; 2,7-DIPHENYLPHENANTHRENE;
D O I
10.1366/0003702924125465
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
A pump-probe instrument is described that utilizes two beams from the same laser and a fiber-optic-based sample cell for low-temperature measurements. The utility of this instrument is demonstrated through an examination of the excited-state kinetics of 2,7-diphenylphenanthrene, for which the rate constant of singlet-to-triplet intersystem crossing is found to be approximately 8 x 10(5) s-1. This molecule is interesting in that it undergoes an unusual rotational conformation change in the triplet state with a rate constant of 2.4 x 10(8) s-1 at 77 K.
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页码:317 / 321
页数:5
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