Vibrational Relaxation of the 2v₅ Overtone of CDCl₃ Highly Excited by a Tea CO₂ Laser

Abstract

A homemade TEA CO2 laser tuned to the 1OP(48) line, 10.91 μm, was used to excite the v4 mode of CDCl3 (914 cm-1). The IR fluorescence signal from the CDCl32v5 overtone band (1492 cm-1) was isolated by means of a gaseous filter. The temporal variation of this fluorescence emission was studied as a function of the laser fluence. Under high excitation conditions, non-linear effects become obvious, and measured rate constants greater than predicted from linear kinetic rate equations have been found.

Observation of isolated ionic liquid cations and water molecules in an inert solvent

“…Even for deuterated solvents, the number of residual C-H moieties is sometimes comparable to that of dissolved ionic liquid molecules and combination bands of C-D stretch modes possibly appear to make the target spectral range crowded. 24 Alkylimidazolium halides used in this article are one the most well-known prototype ionic liquids. When characterizing the alkylimidazolium-based ionic liquids, the IR absorption band of ring C(2)-H and C(4,5)-H stretch modes worked as a good indicator of the cation-anion interaction strength.…”