Picosecond transient infrared spectroscopy of electronically excited 4-dimethylamino-4′-nitrostilbene in the fingerprint region (1640-940 cm−1)

✍ Scribed by Hiromi Okamoto; Mitsuo Tasumi

• Book ID: 103036842
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 498 KB
• Volume: 256
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(96)00486-1

✦ Synopsis

A picosecond infrared spectrometer covering nearly the whole fingerprint region has been constructed. The infrared absorption spectrum of electronically excited (S~ state) 4-dimethylamino-4'-nitrostilbene, which is considered to have an intramolecular charge-transfer character, has been recorded. The molar absorption coefficients of observed prominent absorption bands have been estimated to be of the order of 103 mol-1 dm 3 cm-i. Measurements of polarization dependence (pump polarization parallel/perpendicular to the probe polarization) have been performed for a few prominent bands. Assignments and polarization characteristics of the observed bands are discussed.