A homemade TEA CO, laser tuned to the 10P(48) line, 10.91 mu m, was us
ed to excite the v(4) mode of CDCl3 (914 cm(-1)). The IR fluorescence
signal from the CDCl3 2v(5) overtone band (1492 cm(-1)) was isolated b
y means of a gaseous filter. The temporal variation of this fluorescen
ce emission was studied as a function of the laser fluence. Under high
excitation conditions, non-linear effects become obvious, and measure
d rate constants greater than predicted from linear kinetic rate equat
ions have been found.