ROTATIONAL LEVEL LIFETIMES AND SELF-QUENCHING OF I-127(2) BY FLUORESCENCE DEMODULATION SPECTROSCOPY

Fluorescence demodulation spectroscopy (FDS) has been applied to deter mine lifetimes and self-quenching cross sections of two absorption lin es in the X-B spectrum of 127-iodine. The lines are the R(93), 2-16 (v (n)-v(1)) transition and the P(95), 1-14 (v(n)-v(1)) transition. Both states exhibit pure lifetimes of about 280 ns and cross sections for s elf-quenching of about 46 Angstrom(2). Values of both the lifetimes an d the cross sections are considerably smaller than previously reported .