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  • 1
    Electronic Resource
    Electronic Resource
    The nonresonant-two-photon zero kinetic energy photoelectron spectrum out of the 2Π1/2 electronic ground state of nitric oxide (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 2332-2337 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The nonresonant-two-photon (1+1) zero kinetic energy (ZEKE) photoelectron spectrum out of the 2Π1/2 electronic ground state of nitric oxide is reported. The ZEKE spectra, obtained for different initial temperatures in the jet, show complete rotational resolution of the X 2Σ+ electronic ground state (v+=0) of the ion. Angular momentum transfers up to ΔJ=±7/2 are observed. The rotational J+←J‘ branching ratios determined for this ionization process from a valence state differ remarkably from those observed in two-color resonant ZEKE spectra of electronically excited Rydberg states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463124
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  • 2
    Electronic Resource
    Electronic Resource
    High resolution photoelectron spectra of the NO dimer (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 7171-7174 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: High resolution zero kinetic energy (ZEKE) photoelectron spectra of the NO dimer are measured. They provide information about the ionization energy of the neutral, as well as about the binding energy, vibrations and structure of the ionized dimer indicating considerable structural reorganization of the dimer upon ionization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462551
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  • 3
    Electronic Resource
    Electronic Resource
    Resonance enhancement effects in coherent two-photon ionization of CH3I (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 733-736 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: One-color two-photon zero kinetic energy (ZEKE)-spectra of CH3I were obtained via an intermediate resonant state. In contrast to one-photon spectra an intense progression in the totally symmetric C–I stretching mode ν3+ is observed. The observation can be explained by a resonant-Raman like enhancement in the intermediate dissociative state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465746
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  • 4
    Electronic Resource
    Electronic Resource
    The nonresonant two-photon zero kinetic energy photoelectron spectrum from the electronic ground state of H2S (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 3592-3599 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The nonresonant two-photon (1+1) ZEKE (zero kinetic energy) photoelectron spectrum from the X˜ 1A1 electronic ground state of H2S is reported. Complete rotational resolution of the X˜ 2B1 ground state of the ion was achieved for different temperatures in the jet. The ZEKE spectra show angular momentum transfer up to ΔN=2. The rotationalNKa+Kc++ ← J″Ka″Kc″ branching ratios for the low-lying rotational levels were determined. The strongest transitions are those with ΔKa=Ka+−Ka″=±1 and ΔKc=Kc+−Kc″=0 (type c transitions) but transitions with ΔKa=0 and ΔKc=±1 (type a transitions) also show a surprisingly high intensity. Changes in Ka or Kc up to ±3 are observed. The two-photon spectra are compared with those obtained via one-photon VUV photoionization by other authors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464036
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  • 5
    Electronic Resource
    Electronic Resource
    Two-photon ionization and dissociation of ethyl iodide (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 5417-5427 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Both spin–orbit states of C2H5I+, the X˜1 2E1/2 and the X˜2 2E1/2 electronic states, are studied by one-color two-photon ionization of ethyl iodide, utilizing the zero kinetic energy pulsed field ionization (ZEKE-PFI) photoelectron technique. Compared with conventional photoelectron data the two-photon spectra exhibit a more extensive vibrational structure mainly involving the C–I stretching and the C–C–I bending modes. This additional vibrational excitation in the two-photon spectra is discussed in terms of mode selective resonance enhancement by the dissociative A˜-state continuum. Accurate values for the vibrational frequencies and the ionization energies are obtained. The appearance of nontotally symmetric modes in the two-color ZEKE spectra is reported. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470577
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  • 6
    Electronic Resource
    Electronic Resource
    Collisional enhancement of Rydberg lifetimes observed in vibrational wave packet experiments (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 4538-4550 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Evidence for lifetime enhancement of Rydberg states by interactions with surrounding ions is obtained from femtosecond pump–probe experiments on the vibrational wave packet dynamics of the I2(B)-state, in which either detection of I+2 ions or zero-kinetic energy (ZEKE) electrons was used. The use of the ZEKE technique leads to the appearance of new frequency components in the Fourier transform power spectra of pump–probe time delay scans, as well as the observation of enhanced peak-to-valley ratios in these scans. These observed frequency components do not correspond to any energy level spacings in the molecule; they correspond to a sum of two energy level spacings, suggesting a nonlinear detection mechanism in the ZEKE technique (i.e., interaction with ions). Additional evidence for our interpretation is presented through experiments in which additional ions were formed through nonresonant multiphoton ionization of I2 with a picosecond 266 nm laser, as well as experiments in which both the decay time of the ZEKE signal and the appearance of the pump–probe time delay scans as a function of the pulsed field time delay were studied. Theoretical wave packet calculations which support the conclusions are presented. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470642
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  • 7
    Electronic Resource
    Electronic Resource
    Femtosecond wave-packet dynamics studied by time-resolved zero-kinetic energy photoelectron spectroscopy (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 5566-5569 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Femtosecond pump–probe zero-kinetic-energy (ZEKE) photoelectron spectroscopy is studied using the known wave-packet dynamics of I2 (B state). The 340 fs wave-packet period, wave-packet dephasing and rephasing are observed in the ZEKE signal. The effect of various laser and ZEKE parameters on the wave-packet dynamics is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469285
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  • 8
    Electronic Resource
    Electronic Resource
    The zero kinetic energy photoelectron spectrum of the propargyl radical, C3H3 (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 2575-2578 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the zero kinetic energy photoelectron spectrum of the propargyl radical, C3H3. From the spectrum an ionization energy of 69 953±10 cm−1 (8.673 eV) is deduced. Vibrational frequencies are obtained for the totally symmetric normal modes of the propargyl cation, as well as some combination and overtone bands. Both the frequencies and the relative intensities agree well with the predictions from recent ab initio calculations. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480830
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  • 9
    Electronic Resource
    Electronic Resource
    Zero kinetic energy photoelectron spectra of the allyl radical, C3H5 (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 561-566 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present high resolution zero kinetic energy photoelectron spectra of the allyl radical through various intermediate vibronic states. The spectra yield an ionization energy of 65 762 cm−1, corresponding to 8.153 eV, as well as frequencies for a number of cationic vibrational states. The spectrum from the B 000 state shows activity in modes corresponding to out-of-plane motion of the terminal −CH2 groups. This confirms the nonplanar geometry of this state suggested previously, and thus provides additional insight into the vibronic couplings in the intermediate states. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481831
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  • 10
    Electronic Resource
    Electronic Resource
    Photodissociation dynamics of the propargyl radical (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 3441-3448 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photochemistry and photodissociation dynamics of the propargyl radical, C3H3, upon UV excitation is investigated by time- and frequency-resolved detection of hydrogen atoms. From a statistical analysis of the data, we conclude that formation of cyclopropenylidene, c-C3H2, is the dominant reaction channel. Around 22% of the excess energy is released into the translational degrees of freedom. By varying the excitation energy between 265 and 240 nm, microcanonical rates for the loss of a hydrogen atom can be obtained as a function of excess energy. The experimental rates, on the order of several 106 s−1, are in good agreement with Rice–Ramsperger–Kassel–Marcus (RRKM) calculations, provided a scaling factor is used for the vibrational frequencies, to account for the effects of anharmonicity. The interpretation is confirmed in experiments using monodeuterated propargyl radicals, H2CCCD, indicating a mechanism that proceeds via an initial [1,2] H-shift, followed by cyclization. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479629
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