Persistent infrared laser induced spectral holes in hydrogen bonded polymers

Persistent spectral holes were burned into the profile of the hydrogen bonded OH stretching absorption, near 3500 cm−1, of three polymeric alcohols. The mechanism is an IR induced conformational change of a H-bonded OH group to weaken the hydrogen bond. In one polymer, an empirical quantum efficienc...

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Veröffentlicht in:The Journal of chemical physics 1989-03, Vol.90 (6), p.3380-3388
Hauptverfasser: SHIRK, J. S, PONG, R. G. S, SNOW, A. W
Format: Artikel
Sprache:eng
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Zusammenfassung:Persistent spectral holes were burned into the profile of the hydrogen bonded OH stretching absorption, near 3500 cm−1, of three polymeric alcohols. The mechanism is an IR induced conformational change of a H-bonded OH group to weaken the hydrogen bond. In one polymer, an empirical quantum efficiency of about 5×10−3 was measured and a hole depth of 20% of the absorption was achieved with a low power cw laser. The conformational changes occur near the bond which is excited and before extensive intramolecular vibrational randomization.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.455840