Vibrational overtone spectra of N-H stretches and intramolecular dynamics on the ground and electronically excited states of methylamine

The Journal of Chemical Physics
Ran MaromIlana Bar

Abstract

The vibrational pattern and energy flow in the N-H stretch manifolds and the dissociation dynamics of methylamine (CH(3)NH(2)) were investigated via vibrationally mediated photodissociation. Action spectra and Doppler profiles, reflecting the yield of the ensuing H photofragments, versus near infrared/visible vibrational excitation and UV excitation, respectively, were measured. The jet-cooled action spectra and the simultaneously measured room temperature photoacoustic spectra of the first to third N-H stretching overtones exhibit broad features, somewhat narrower in the former, consisting of barely recognized multiple bands. Two phases of fitting of the spectroscopic data were performed. In the first phase, the raw data were analyzed to obtain band positions, types, intensities, and transition linewidths. In the second, the information derived from the first phase was then used as data in a fit to joint local mode/normal mode (LM/NM) and NM Hamiltonian parameters. The derived parameters predicted well band positions and allowed band assignment. The LM/NM Hamiltonian and the extracted Lorentzian linewidths enabled the determination of the initial pathways for energy redistribution and the overall temporal behavior of the N-H s...Continue Reading

References

May 6, 2006·The Journal of Chemical Physics·Alexander PortnovIlana Bar
Oct 25, 2006·The Journal of Chemical Physics·Amir GolanIlana Bar

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Citations

Sep 25, 2014·The Journal of Physical Chemistry. a·James O ThomasCraig Murray
May 24, 2013·The Journal of Chemical Physics·Alexander PortnovIlana Bar
Feb 12, 2009·The Journal of Chemical Physics·Amir GolanIlana Bar
Jan 21, 2012·The Journal of Chemical Physics·Alexander PortnovIlana Bar
Jul 2, 2010·The Journal of Chemical Physics·Ran MaromIlana Bar
Jul 8, 2008·The Journal of Chemical Physics·C LeviM Baer
May 2, 2009·The Journal of Chemical Physics·Ran MaromIlana Bar
Jul 8, 2015·Physical Chemistry Chemical Physics : PCCP·Michael EpshteinIlana Bar
Jul 3, 2020·The Journal of Chemical Physics·Kelsey A Parker, Donald G Truhlar
Feb 2, 2010·Physical Chemistry Chemical Physics : PCCP·Michael N R AshfoldAlan G Sage
May 26, 2009·The Journal of Physical Chemistry. a·C LeviM Baer

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