Tracking asymmetric intramolecular vibrational redistribution of nitromethane

Xiaosong Liu; Wei Zhang; Yunfei Song; Weilong Liu; Zhe Lv; Yanqiang Yang

doi:10.1016/j.molstruc.2020.129342

Tracking asymmetric intramolecular vibrational redistribution of nitromethane

Xiaosong Liu^*
, Wei Zhang
, Yunfei Song
, Weilong Liu
, Zhe Lv
, Yanqiang Yang

^*Corresponding author for this work

School of Physics

Harbin Institute of Technology
China Academy of Engineering Physics

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Femtosecond time- and frequency-resolved coherent anti-Stokes Raman scattering (CARS) spectroscopy is proposed to selectively excite parent vibrational modes and detect energy flow to daughter modes in liquid nitromethane (NM, CH₃NO₂). The NO symmetric bending mode (δ_sNO₂~657cm⁻¹, symmetry: A₁), CN symmetric stretching mode (ν_s(CN)~918cm⁻¹, symmetry: A₁), CH₃ rocking mode (ρ(CH₃)~1104cm⁻¹, symmetry: B₁), nitro group stretching modes (ν_s(NO₂)~1379cm⁻¹, symmetry: A₁ and ν_a(NO₂)~1560cm⁻¹, symmetry: B₁) of nitromethane (NM) are selectively excited in an orderly manner, vibrational energy flow to the neighboring higher ones located outside the excitation range is observed. Counterintuitive up-hill energy flow from lower frequency modes to higher ones is related to the vibrational symmetry. What's more, it is also found that up-hill intramolecular vibrational energy redistribution efficiencies decrease monotonically with the increase of the frequency differences.

Original language	English
Article number	129342
Journal	Journal of Molecular Structure
Volume	1226
DOIs	https://doi.org/10.1016/j.molstruc.2020.129342
State	Published - 15 Feb 2021

Keywords

Multiphonon up-pumping
Selective excitation
Up-hill energy
Vibrational symmetry

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10.1016/j.molstruc.2020.129342

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@article{bda268432c1c4ea69873796b3ab59ed7,

title = "Tracking asymmetric intramolecular vibrational redistribution of nitromethane",

abstract = "Femtosecond time- and frequency-resolved coherent anti-Stokes Raman scattering (CARS) spectroscopy is proposed to selectively excite parent vibrational modes and detect energy flow to daughter modes in liquid nitromethane (NM, CH3NO2). The NO symmetric bending mode (δsNO2\textasciitilde{}657cm−1, symmetry: A1), CN symmetric stretching mode (νs(CN)\textasciitilde{}918cm−1, symmetry: A1), CH3 rocking mode (ρ(CH3)\textasciitilde{}1104cm−1, symmetry: B1), nitro group stretching modes (νs(NO2)\textasciitilde{}1379cm−1, symmetry: A1 and νa(NO2)\textasciitilde{}1560cm−1, symmetry: B1) of nitromethane (NM) are selectively excited in an orderly manner, vibrational energy flow to the neighboring higher ones located outside the excitation range is observed. Counterintuitive up-hill energy flow from lower frequency modes to higher ones is related to the vibrational symmetry. What's more, it is also found that up-hill intramolecular vibrational energy redistribution efficiencies decrease monotonically with the increase of the frequency differences.",

keywords = "Multiphonon up-pumping, Selective excitation, Up-hill energy, Vibrational symmetry",

author = "Xiaosong Liu and Wei Zhang and Yunfei Song and Weilong Liu and Zhe Lv and Yanqiang Yang",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2021",

month = feb,

day = "15",

doi = "10.1016/j.molstruc.2020.129342",

language = "英语",

volume = "1226",

journal = "Journal of Molecular Structure",

issn = "0022-2860",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Tracking asymmetric intramolecular vibrational redistribution of nitromethane

AU - Liu, Xiaosong

AU - Zhang, Wei

AU - Song, Yunfei

AU - Liu, Weilong

AU - Lv, Zhe

AU - Yang, Yanqiang

PY - 2021/2/15

Y1 - 2021/2/15

N2 - Femtosecond time- and frequency-resolved coherent anti-Stokes Raman scattering (CARS) spectroscopy is proposed to selectively excite parent vibrational modes and detect energy flow to daughter modes in liquid nitromethane (NM, CH3NO2). The NO symmetric bending mode (δsNO2~657cm−1, symmetry: A1), CN symmetric stretching mode (νs(CN)~918cm−1, symmetry: A1), CH3 rocking mode (ρ(CH3)~1104cm−1, symmetry: B1), nitro group stretching modes (νs(NO2)~1379cm−1, symmetry: A1 and νa(NO2)~1560cm−1, symmetry: B1) of nitromethane (NM) are selectively excited in an orderly manner, vibrational energy flow to the neighboring higher ones located outside the excitation range is observed. Counterintuitive up-hill energy flow from lower frequency modes to higher ones is related to the vibrational symmetry. What's more, it is also found that up-hill intramolecular vibrational energy redistribution efficiencies decrease monotonically with the increase of the frequency differences.

AB - Femtosecond time- and frequency-resolved coherent anti-Stokes Raman scattering (CARS) spectroscopy is proposed to selectively excite parent vibrational modes and detect energy flow to daughter modes in liquid nitromethane (NM, CH3NO2). The NO symmetric bending mode (δsNO2~657cm−1, symmetry: A1), CN symmetric stretching mode (νs(CN)~918cm−1, symmetry: A1), CH3 rocking mode (ρ(CH3)~1104cm−1, symmetry: B1), nitro group stretching modes (νs(NO2)~1379cm−1, symmetry: A1 and νa(NO2)~1560cm−1, symmetry: B1) of nitromethane (NM) are selectively excited in an orderly manner, vibrational energy flow to the neighboring higher ones located outside the excitation range is observed. Counterintuitive up-hill energy flow from lower frequency modes to higher ones is related to the vibrational symmetry. What's more, it is also found that up-hill intramolecular vibrational energy redistribution efficiencies decrease monotonically with the increase of the frequency differences.

KW - Multiphonon up-pumping

KW - Selective excitation

KW - Up-hill energy

KW - Vibrational symmetry

UR - https://www.scopus.com/pages/publications/85091768950

U2 - 10.1016/j.molstruc.2020.129342

DO - 10.1016/j.molstruc.2020.129342

M3 - 文章

AN - SCOPUS:85091768950

SN - 0022-2860

VL - 1226

JO - Journal of Molecular Structure

JF - Journal of Molecular Structure

M1 - 129342

ER -

Tracking asymmetric intramolecular vibrational redistribution of nitromethane

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Keywords

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