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  • 1
    Electronic Resource
    Electronic Resource
    Photodissociation of propyne and allene at 193 nm with vacuum ultraviolet detection of the products (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 3320-3325 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vacuum ultraviolet (VUV) laser photoionization is combined with time-of-flight (TOF) mass spectrometry to determine the photofragments produced from the laser photodissociation of allene and propyne in a molecular beam. Detection of C3H3+ confirms that atomic hydrogen elimination is the primary process for both of these molecules. A hydrogen molecule elimination channel and a low mass carbon fragmentation channel of allene to produce C3H2+H2 and CH2+C2H2, respectively, have also been identified. Different ratios of various dissociation channels from these two molecules suggest that the dissociation mechanisms of these two isomers are different. Dissociation must occur before complete isomerization. These results are discussed in terms of recent theoretical calculations on the ground and excited states of these molecules. Secondary photodissociation of the products has been observed, even though the laser energies that have been used are less than 8 mJ/cm2 and the photolysis laser is not focused. Therefore, the present results show how important it is to determine product distributions as a function of the laser energy. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478197
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  • 2
    Electronic Resource
    Electronic Resource
    Photoionization of methanol dimer using a tunable vacuum ultraviolet laser (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 3434-3440 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Methanol dimer (CD3OH)2 ion–molecule reaction is initialized by VUV (vacuum ultraviolet) laser photoionization. The proton and deuteron transfers are the dominant reactions. The relative probabilities of deuteron transfer from the methyl group and proton from the hydroxyl group were measured as a function of VUV photon energy between 10.91 to 10.49 eV. According to those results, the probability of proton transfer from the hydroxyl group increases with the VUV photon energy. Isotopic scrambling is not complete before dissociation of the ion complex in the photon energy used. In addition, ab initio calculations are performed and four stable structures of the methanol dimer ion are found. One of these structures is an unreported complex, CD3OHD+(centered ellipsis)CD2OH, which has a very unusual type of hydrogen bond. This complex plays a significant role in the deuteron transfer reaction in the range of excitation energies used in this study. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479628
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  • 3
    Electronic Resource
    Electronic Resource
    Pulsed amplification of cw dye laser with undetectable amplified spontaneous emission (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 3309-3312 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have constructed a cw dye master oscillator/dye pulse-amplifier system that generates 4 ns, 100 mJ pulses with a repetition rate of 30 Hz. The output pulse has a bandwidth of 275 MHz. Backward-stimulated Brillouin scattering is used to control the growth of amplified spontaneous emission (ASE). The content of ASE in the final output is under our detection limit (〈10−4) for the entire tuning range. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1288265
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  • 4
    Electronic Resource
    Electronic Resource
    A differentially pumped harmonic filter on the Chemical Dynamics Beamline at the Advanced Light Source (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 4841-4844 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A differentially pumped rare gas cell has been developed to suppress undulator harmonics on the Chemical Dynamics Beamline at the Advanced Light Source. Greater than 104 suppression of the harmonics has been demonstrated with no measurable (〈5%) attenuation of the fundamental. The overall design is presented, and vacuum and optical performance are reported. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146161
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  • 5
    Electronic Resource
    Electronic Resource
    Dynamics of H2 elimination from 1,4-cyclohexadiene (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 3230-3231 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dynamics of H2 elimination from 1,4-cyclohexadiene (CHDN), dissociated with 212 nm light, have been studied by state specific probing of the H2 product via (1+1) REMPI using a transform limited vacuum ultraviolet laser system. The quantum state distributions, the translational energy distribution and the Doppler profiles were measured giving a "rotational temperature'' of (approximately-equal-to)1600 K, a "vibrational temperature'' of (approximately-equal-to)4000 K, and a translational energy of (approximately-equal-to)30 kcal/mol for H2. Anisotropy in the Doppler profiles indicates that the H2's velocity vector is aligned parallel to its rotational angular momentum vector.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457873
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  • 6
    Electronic Resource
    Electronic Resource
    Dynamics of H2 elimination from cyclohexadiene (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 297-307 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A comprehensive study of the dynamics of H2 elimination from 1,4 and 1,3 cyclohexadiene is reported. Rotational and vibrational quantum state distributions as well as translation energy distributions for the H2 product are measured. State specific detection of H2 is accomplished with a transform limited vacuum ultraviolet–extreme ultraviolet laser system via (1+1) resonance enhanced multiphoton ionization (REMPI). Rate constants for the H2 elimination and 1,4 to 1,3 isomerization reactions are derived. A (v,J) correlation for H2 with v(parallel)J primarily is observed from anisotropy in the Doppler profiles. A clear picture of the transition state configuration of 1,4 cyclohexadiene is provided from the information obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461487
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  • 7
    Electronic Resource
    Electronic Resource
    State-selective ionization of nitrogen in the X 2Σ+gv+=0 and v+=1 states by two-color (1+ 1) photon excitation near threshold (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 6006-6012 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Efficient generation of N+2X 2Σ+g(v+=0,1) is demonstrated by an extreme-ultraviolet +visible (1+1) photon excitation scheme. The c'4 1Σ+u (v'=0,1) Rydberg states are used as intermediates. The N2 molecules are ionized near the v+=0 and v+=1 ionization thresholds. The autoionizing ndδg 1Δg Rydberg series with the rotational quantum numbers N=4, 5, and 6 (in the limit of l uncoupling) are observed for the first time. Extrapolation of the N=4 series yields an ionization energy of N2 of 125 666.959(67) cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457417
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  • 8
    Electronic Resource
    Electronic Resource
    Frequency tripling into the 720–1025-A(ring) region with pulsed free jets (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 1616-1620 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed a coherent source of XUV light, which is continuously tunable between 904 and 1024 A(ring), and line tunable to 720 A(ring). It employs the technique of frequency tripling in a pulsed free jet of gas, and requires a single tunable laser system. Spectra of the relative XUV output vs wavelength in the 904–1024-A(ring) range are presented for the tripling gases Ar, Kr, Xe, CO, and N2. Also listed are relative outputs obtained by tripling at resonantly enhanced lines between 720 and 900 A(ring) in Kr, Xe, and CO. Possible improvements to the source are discussed, and examples of its application are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139356
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  • 9
    Electronic Resource
    Electronic Resource
    Erratum: Frequency tripling into the 720–1025-A(ring) region with pulsed free jets [Rev. Sci. Instrum. 58, 1616 (1987)] (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 673-673 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139811
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  • 10
    Electronic Resource
    Electronic Resource
    Ultranarrow bandwidth VUV-XUV laser system (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2888-2892 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An ultrahigh-brightness laser system has been developed to study the spectroscopy and dynamics of molecules and clusters in the vacuum ultraviolet (VUV) extreme ultraviolet (XUV) spectral region. The laser utilizes pulse amplification of a single-mode ring dye laser, frequency doubling, and four-wave mixing in a pulsed jet. Pulse energies of 〉100 mJ in the visible and 〉1011 photons/pulse in the VUV-XUV have been obtained. The bandwidth of the laser has been measured to be 91 MHz in the visible and 210 MHz in the XUV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140623
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