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Vibrational relaxation pathways of amide I and amide II modes in N-methylacetamide
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10.1063/1.4705120
/content/aip/journal/jcp/136/16/10.1063/1.4705120
http://aip.metastore.ingenta.com/content/aip/journal/jcp/136/16/10.1063/1.4705120
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Molecular structure of the trans-NMA molecule. The black arrows indicate the atomic motions associated with the amide I and amide II vibrations.

Image of FIG. 2.
FIG. 2.

Spectra of the probe pulse (dotted) and the two pump pulses used to excite either the amide I or amide II modes of the NMA molecule (dashed and dashed-dotted lines, respectively). The absorption spectrum of a 10 mM solution of NMA in CHBr3 is represented by the solid line.

Image of FIG. 3.
FIG. 3.

Transient spectra in the frequency range of the AI and AII modes at different delay times following excitation of the AI mode of a 10 mM solution of NMA in CHBr3. The solid lines represent the results of a fit to the relaxation model described in the text. For clarity, the response of the AII mode has been multiplied by a factor of 13. The arrows indicate the time evolution of the amplitude of the spectra.

Image of FIG. 4.
FIG. 4.

Time traces recorded at four different frequencies corresponding to the maxima of the bleach and the induced absorption signals of the AI and AII modes. The frequencies are marked with solid vertical lines in Figure 3. The solid black lines represent the results of a fit to the relaxation model described in the text.

Image of FIG. 5.
FIG. 5.

Transient spectra at different delay times following excitation of the AII mode of a 10 mM solution of NMA in CHBr3. The solid lines represent the results of a fit to the relaxation model described in the text. The black arrows indicate the time evolution of the amplitude of the spectra.

Image of FIG. 6.
FIG. 6.

Time traces recorded at four different frequencies corresponding to the maxima of the bleach and the induced absorption signals of the AI and AII modes following excitation of the AII mode. The solid lines result from a fit to the relaxation model described in the text.

Image of FIG. 7.
FIG. 7.

Schematic representation of the relaxation model used in describing the relaxation pathways of the AI and AII modes in single NMA molecules upon excitation of either of the two modes.

Image of FIG. 8.
FIG. 8.

Extracted differential spectra corresponding to the excited states of the AI mode (blue and green), the excited state of the AII mode (red), and the thermally equilibrated state (black).

Image of FIG. 9.
FIG. 9.

Anisotropy time traces of the AI mode (open circles) and the AII mode (solid circles) after excitation of the AI mode. The solid lines represent an exponential function fitted to the AI mode anisotropy, and a constant value for the anisotropy of the AII mode.

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/content/aip/journal/jcp/136/16/10.1063/1.4705120
2012-04-25
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Vibrational relaxation pathways of amide I and amide II modes in N-methylacetamide
http://aip.metastore.ingenta.com/content/aip/journal/jcp/136/16/10.1063/1.4705120
10.1063/1.4705120
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