Femtosecond vibrational dephasing of the CN stretching in alkanenitriles with long alkyl chains. Dependence on the chain length and hydrogen bonding

✍ Scribed by Hiromi Okamoto; Ryoji Inaba; Mitsuo Tasumi; Keitaro Yoshihara

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 475 KB
• Volume: 206
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(93)85570-e

✦ Synopsis

Femtosecond time-resolved coherent anti-Stokes Raman scattering has been observed for the C-N stretching vibration of alkanenitriles ( CnHrn+ t CN, n E l-17). The vibrational dephasing rates ( 1 / Fr ) observed for the neat alkanenitriles are proportional to the square root ofthe number of carbon atoms (n) in the alkyl chain. The dephasing rates observed for mixtures of the alkanenitriles with methanol ( 1: 1 mole ratio) are about 30% faster than those for the corresponding neat alkanenitriles. Possible origins of this acceleration in the dephasing rate are discussed.