• Title/Summary/Keyword: Photodissociation

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Photodissociation Dynamics of$H_2O_2$ at 280-290 nm

  • Baek, Seon Jong;Sin, Seung Geun;Park, Chan Ryang;Kim, Hong Rae
    • Bulletin of the Korean Chemical Society
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    • v.16 no.3
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    • pp.256-260
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    • 1995

  • Laser induced fluorescence spectra of OH produced from photodissociation of $H_2O_2$ at 280-290 nm in the gas phase have been observed. By analyzing the Doppler profiles, the anisotropy parameter($\beta$ =-0.7) and the center of mass translational energy of the fragments have been measured. The measured energy distribution is well described by an impulsive model. The excited state leading to dissociation is found to be of 1Au symmetry. The dissociation from this state is prompt and direct with the fragment OH rotating in the plane perpendicular to the O-O bond axis.

  • https://doi.org/10.5012/bkcs.1995.16.3.256 인용 PDF

Theoretical Study on the Nonadiabatic Transitions in the Photodissociation of Cl2, Br2, and I2

  • Asano, Yukako;Yabushita, Satoshi
    • Bulletin of the Korean Chemical Society
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    • v.24 no.6
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    • pp.703-711
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    • 2003

  • We have theoretically studied the nonadiabatic transitions among the five lower states with the Ω=$1_u$ symmetry ($1_u^{(1)} to 1_u^{(5)}$) in the photodissociation of Cl₂, Br₂, and I₂by using the spin-orbit configuration interaction (SOCI) method and the semiclassical time-dependent coupled Schrodinger equations. From the configuration analyses of the SOCI wavefunctions, we found that the nonadiabatic transition between $1_u^{(2)}$ and $1_u^{(1)}$ is a noncrossing type, while that between $1_u^{(3)}$ and $1_u^{(4)}$ is a crossing type for all the molecules. The behavior of the radial derivative coupling element between $1_u^{(1)}$ and $1_u^{(2)}$ and that between $1_u^{(3)}$ and $1_u^{(4)}$ is analyzed in detail. In Cl₂, nonadiabatic transitions can take place even between the states correlating to different dissociation limits, while in Br₂ and I₂, with the usual photon energies e.g. less than 20 eV, nonadiabatic transitions occur only between the states correlating to the same dissociation limits, reflecting the different magnitudes of the spin-orbit interactions.

  • https://doi.org/10.5012/bkcs.2003.24.6.703 인용 PDF KSCI

Dynamics of Br(2Pj) Formation in the Photodissociation of Bromobenzene

  • Paul, Dababrata;Kim, Hyun-Kook;Hong, Ki-Ryong;Kim, Tae-Kyu
    • Bulletin of the Korean Chemical Society
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    • v.32 no.2
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    • pp.659-663
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    • 2011

  • The photodissociation dynamics of bromobenzene near 234 nm has been investigated using a two-dimensional photofragment ion-imaging technique coupled with a state-selective [2+1] resonance-enhanced multiphoton ionization (REMPI) scheme. The nascent Br atoms are produced by the primary C-Br bond dissociation, which leads to the formation of $C_6H_5$ ($\tilde{X}$) and Br($^2P_j$, j = 1/2, 3/2). The observed translational energy distributions have been fitted by a single Boltzmann function and two Gaussian functions. Trimodal translational energy distributions of Br($^2P_j$) have been assigned to the direct/indirect dissociation mechanisms originating from the initially excited $^3({\pi},{\pi}^*)$ state. The assignments have been confirmed by the recoil anisotropy and distribution width corresponding to the individual components.

  • https://doi.org/10.5012/bkcs.2011.32.2.659 인용 PDF KSCI