Photodissociation of [Ar–N2]+ induced by a near-IR (800 nm) femtosecond laser pulse is investigated using ion-trap time-of-flight mass spectrometry. The intra-complex charge transfer proceeding in the course of the decomposition of the electronically excited Ar+(2P3/2)⋯N2(X1Σg+), prepared by the photoexcitation of the electronic ground Ar(1S0)⋯N2+(X2Σg+), is probed by the ion yields of Ar+ and N2+. The yield ratio γ of N2+ with respect to the sum of the yields of Ar+ and N2+ is determined to be γ = 0.62, which is much larger than γ ∼ 0.2 determined before when the photodissociation is induced by a nano-second laser pulse in the shorter wavelength region between 270 and 650 nm. This enhancement of γ at 800 nm and the dependence of γ on the excitation wavelength are interpreted by numerical simulations, in which the adiabatic population transfer from Ar+(2P3/2)⋯N2(X1Σg+) to Ar(1S0)⋯N2+(X2Σg+) at the avoided crossings is accompanied by the vibrational excitation in the N2+(X2Σg+) moiety followed by the intra-complex vibrational energy transfer from the N2+(X2Σg+) moiety to the intra-complex vibrational mode leading to the dissociation.
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7 May 2021
Research Article|
May 06 2021
Photodissociation of [Ar–N2]+ induced by near-IR femtosecond laser fields by ion-trap time-of-flight mass spectrometry
Takahiro Suzuki;
Takahiro Suzuki
Department of Chemistry, School of Science, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Reika Kanya;
Reika Kanya
a)
Department of Chemistry, School of Science, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Kaoru Yamanouchi
Kaoru Yamanouchi
b)
Department of Chemistry, School of Science, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
b)Author to whom correspondence should be addressed: kaoru@chem.s.u-tokyo.ac.jp
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a)
Current address: Department of Chemistry, Faculty of Science, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji-shi, Tokyo 192-0397, Japan.
b)Author to whom correspondence should be addressed: kaoru@chem.s.u-tokyo.ac.jp
J. Chem. Phys. 154, 174303 (2021)
Article history
Received:
March 06 2021
Accepted:
April 12 2021
Citation
Takahiro Suzuki, Reika Kanya, Kaoru Yamanouchi; Photodissociation of [Ar–N2]+ induced by near-IR femtosecond laser fields by ion-trap time-of-flight mass spectrometry. J. Chem. Phys. 7 May 2021; 154 (17): 174303. https://doi.org/10.1063/5.0049560
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