OH and NH Stretching Vibrational Relaxation of Liquid Ethanolamine

Zeitschrift fur Physikalische Chemie - Tập 225 Số 9-10 - Trang 913-926 - 2011
Stephan Knop1, Jörg Lindner1, Peter Vöhringer2
1Rheinische Friedrich-Wilhelms-Universität Bonn, Lehrstuhl für Molekulare Physikalische Chemie, Bonn, Deutschland
2Lehrstuhl für Molekulare Physikalische Chemie, Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Wegelerstraße 12, 53115 Bonn, Germany

Tóm tắt

Abstract Femtosecond mid-infrared pump-probe spectroscopy was carried out to obtain information about the dynamics of vibrational energy relaxation in liquid ethanolamine at room temperature and ambient pressure. Through partial deuteration it was possible to disentangle the dynamics resulting from the OH and the NH stretching modes that proceed independently and simultaneously in the hydrogen-bonded liquid following an ultrafast vibrational excitation by a resonant mid-infrared pulse. The OH-stretching vibrational lifetime was determined to be 450 fs while the NH-stretching lifetime was found to be 1.2 ps. This large difference in lifetimes highlights the importance of the hydrogen-donating and the hydrogen-accepting character of the vibrating groups that are engaged in hydrogen-bonding.

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Zeitschrift fur Physikalische Chemie

Tập 225 Số 9-10

913-926

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