Vibrational relaxation pathways of amide I and amide II modes in N-methylacetamide

The Journal of Chemical Physics
L Piatkowski, Huib J Bakker

Abstract

We studied the vibrational energy relaxation mechanisms of the amide I and amide II modes of N-methylacetamide (NMA) monomers dissolved in bromoform using polarization-resolved femtosecond two-color vibrational spectroscopy. The results show that the excited amide I vibration transfers its excitation energy to the amide II vibration with a time constant of 8.3 ± 1 ps. In addition to this energy exchange process, we observe that the excited amide I and amide II vibrations both relax to a final thermal state. For the amide I mode this latter process dominates the vibrational relaxation of this mode. We find that the vibrational relaxation of the amide I mode depends on frequency which can be well explained from the presence of two subbands with different vibrational lifetimes (~1.1 ps on the low frequency side and ~2.7 ps on the high frequency side) in the amide I absorption spectrum.

References

Mar 23, 2000·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·M Akiyama, H Torii
Feb 14, 2002·Proceedings of the National Academy of Sciences of the United States of America·Samir Kumar PalAhmed H Zewail
Apr 15, 2004·Chemical Reviews·Samir Kumar Pal, Ahmed H Zewail
Sep 22, 2006·The Journal of Physical Chemistry. B·Lauren P DeFloresAndrei Tokmakoff
Nov 27, 2007·The Journal of Chemical Physics·Arend G DijkstraJasper Knoester
Oct 16, 2009·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Xiao-Nan Jiang, Chang-Sheng Wang
Oct 15, 2010·The Journal of Physical Chemistry. a·L Piatkowski, H J Bakker

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Citations

Jul 22, 2016·Journal of Chemical Theory and Computation·Michael SchauperlKlaus R Liedl
Sep 4, 2019·Physical Chemistry Chemical Physics : PCCP·Andrea Amadei, Massimiliano Aschi

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Methods Mentioned

BETA
infrared vibrational spectroscopy
infrared spectroscopy

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