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  • 1
    Electronic Resource
    Electronic Resource
    Time-resolved kinetic studies on quenching of CH(A 2Δ and B 2Σ−) by (CX3)2CO, CF3COOX, and CXCl3 (X=H or D) and alkane molecules (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 1070-1075 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The quenching rate constants kq of CH(A 2Δ and B 2Σ−) radicals by (CX3)2CO, CF3COOX, and CXCl3 (X=H or D), and some alkane molecules have been measured using laser photolysis of CHBr3 at 266 nm to produce CH radicals and time-resolved fluorescence quenching measurements. An isotope effect is found on quenching of both A and B states by deuterated and hydride molecules and the quenching rate constants of both A and B states increase steadily with increase of the number of C–H bonds contained in the alkane molecules. The formation cross sections of complexes of electronically excited CH radicals and alkane molecules were calculated by means of a collision complex model. It is shown that the dependence of the formation cross section of complex on the number of C–H bonds contained in alkane molecules is in agreement with that of the measured quenching cross section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465406
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  • 2
    Electronic Resource
    Electronic Resource
    Investigation of the collisional quenching of CH(A 2Δ and B 2Σ−) by Ar, O2, CS2, alcohol, and halomethane molecules (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 5727-5730 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The quenching rate constants of CH(A 2Δ and B 2Σ−) by Ar, O2, CS2, alcohol, and halomethane molecules have been measured at 290 K by using the direct time-resolved technique. The electronically excited CH radicals were produced by laser photolysis of CHBr3 at 266 nm and the time-resolved emissions of CH(A 2Δ and B 2Σ−–X 2Π) were then monitored as a function of time using a fast digital storage oscilloscope coupled with a microcomputer. For a given partner, the collisional removal rate of CH(B 2Σ−) is faster than that of CH(A 2Δ) except for O2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467358
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  • 3
    Electronic Resource
    Electronic Resource
    State resolved rotational relaxation of CS2 in argon free jet (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 3617-3621 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rotational relaxation of CS2 in argon free jet was studied using laser-induced fluorescence (LIF). The rotational populations were obtained from LIF detection at 19 different points along the jet axis from 3 to 15 nozzle diameters. On the basis of the energy gap power law, the master equation was solved to fit the experiment results, and the two temperature-independent parameters in the law were determined. The results show that the state-to-state relaxation cross sections vary as the inverse 1.7 power of the energy gap between the initial and the final states. The expressions for the state-to-state relaxation cross sections and the rate constants were written. The relaxation cross sections decrease with increasing temperature over the range of 2–60 K for the CS2+Ar collision. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468590
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  • 4
    Electronic Resource
    Electronic Resource
    V–E energy transfer in ethylene and alkali gas mixtures using infrared multiphoton excitation (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 5700-5707 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: V–E energy transfer in C2H4 and alkali gas system C2H
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468423
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  • 5
    Electronic Resource
    Electronic Resource
    The fluorescence excitation spectra of the A 1Au(S1)–X 1Ag(S0) transition of biacetyl: Determination of the band origin (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 6650-6651 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Laser-induced fluorescence spectra of the A 1Au(S1)–X 1Ag(S0) transition of biacetyl are observed under supersonic jet condition. Three weaker bands have been observed at 154, 67, and 58 cm−1 to the red of the previously presumed band origin 000 (at 22 336 cm−1). The observed tunneling splitting 1.05 cm−1 for the G01 band and 1.68 cm−1 for the A01 band are compared to the theoretical result. Based on the tunneling splitting, the true band origin 000 is determined for the first time as the furthest weaker band at 22 182 cm−1. The three weaker bands have been assigned as 000, G01, and A01 transitions, respectively. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480013
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  • 6
    Electronic Resource
    Electronic Resource
    A˜ 2Πu state-intermediated two-photon dissociation of CS2+ via the first channel (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 10768-10772 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The [1+1] A˜ 2Πu-state resonance enhanced two-photon dissociation process of CS2+ molecular ions has been investigated by measuring the photofragment S+ excitation (PHOFEX) spectrum in the wavelength range of 424–482 nm, where the CS2+ molecular ions were prepared purely by [3+1] multiphoton ionization of the neutral CS2 molecules at 483.2 nm. The PHOFEX spectrum was assigned essentially to the CS2+(A˜ 2Πu)←CS2+(X˜ 2Πg) transition, and the dissociation mechanism of CS2+ was preliminarily attributed to (i) CS2+(X˜ 2Πg)→CS2+(A˜ 2Πu) through one-photon excitation, (ii) CS2+(A˜ 2Πu)→CS2+(X˜†) via internal conversion process due to the vibronic coupling between the A˜ and X˜ states, (iii) CS2+(X˜†)→CS2+(B˜ 2Σu+) through the second photon excitation, and (iv) CS2+(B˜ 2Σu+)→S++CS owing to the potential curve crossing with the repulsive 4Σ− state correlated with the first dissociation limit. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1377600
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  • 7
    Electronic Resource
    Electronic Resource
    Theoretical treatment of resonance radiation imprisonment: new approach to Holstein's equation (1993)
    Springer
    The European physical journal 27 (1993), S. 223-228 
    Details
    ISSN: 1434-6079
    Keywords: 32.50. + d ; 32.90. + a
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theoretical treatments of the resonance radiation imprisonment are generally based upon Holstein's equation. However a solution that could provide both the initial time behavior and that of the infinitely late moment by a finite number of terms has been lacked so far. A new approach is proposed in this paper, which directly integrates the equation by means of operator calculation and results in an expression expanded in a series in time. Our study on the behavior of the high order coefficients of this series leads to a success in overcoming the difficulty to obtain the sum of infinite terms and achieving a complete description of the time behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436535
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  • 8
    Electronic Resource
    Electronic Resource
    Kinetic studies on state-state coupling and collisional quenching of excited sulfur dioxide (1998)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 30 (1998), S. 831-837 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The time-resolved total emission of SO2 (B1B1→X1A1) at 354.9 nm were monitored following the direct excitation by a 266 nm laser pulse. A three-level model was proposed to deal with SO2 (X1A1, A1A2, B1B1) system. From a kinetic treatment of these measurements, the coupling coefficient, ξ, and the relaxation time, τ, relating to the high vibronic levels of A1A2 and B1B1 states were first obtained. It is found that ξ and τ values keep basically constant, reflecting the characteristics of the studied system. In addition, the quenching rate constants of SO2 (A1A2, B1B1) by some alkane and chloromethane molecules were measured at room temperature. The formation cross sections of complexes of SO2 (A1A2, B1B1) and quenchers were calculated by means of a collision complex model. It is shown that the dependence of the formation cross section of complex on the number of C(SINGLEBOND)H or C(SINGLEBOND)Cl bonds is generally in agreement with that of the measured quenching cross section. © 1998 John Wiley & Sons, Inc. Int J Chem Kinet 30: 831-837, 1998
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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