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  • 1
    Electronic Resource
    Electronic Resource
    Effects of Cooper minima in resonance enhanced multiphoton ionization-photoelectron spectroscopy of NO via the D 2Σ+ and C 2Π Rydberg states (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 6456-6462 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Cooper minima are predicted to occur in the 3pσ→kσ(l=2) and 3pσ→kπ(l=2) channels in the resonance enhanced multiphoton ionization of NO via the D 2Σ+(3pσ) Rydberg state. The low energy kσ(l=2) Cooper minimum leads to the observed ΔN=N+−N'=0 photoelectron peak, in addition to the ΔN=±1, ±3 peaks seen in the rotational spectra. The Cooper minima are accompanied by significant l mixing in the continuum due to the nonspherical molecular potential and result in a strong dependence of rotational branching ratios and angular distributions on photoelectron kinetic energy. A Cooper minimum is also predicted in the 3pπ→kδ(l=2) channel for photoionization of the C 2Π(3pπ) Rydberg state. The effect of this Cooper minimum on photoelectron spectra and photoelectron angular distributions is also investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461542
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  • 2
    Electronic Resource
    Electronic Resource
    Ion rotational distributions for near-threshold photoionization of H2O (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 7848-7851 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ion rotational distributions for single-photon VUV photoionization of the 1b1 orbital of the X˜ 1A1 ground state of the jet-cooled water are reported. These spectra reveal significant type a transitions which are seen to arise from odd angular momentum components of the photoelectron matrix element. The resulting photoionization dynamics are quite nonatomic-like.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462381
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  • 3
    Electronic Resource
    Electronic Resource
    Non-Franck–Condon effects in photoionization of the 3 3Π Rydberg state of NH (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 7874-7882 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Strong non-Franck–Condon behavior is predicted to occur in the vibrationally resolved photoionization spectra of NH for (3+1) resonance enhanced multiphoton ionization processes via the 3 3Π Rydberg state. The non-Franck–Condon effects are interpreted on the basis of rapid orbital evolution, Cooper minima, and internuclear distance dependence of the dipole transition moment and cross sections. A Cooper minimum occurs in the 5σ→kπ channel at small internuclear distances, where NH resembles its united atom, oxygen. The iterative Schwinger variational method and multiplet-specific ion potentials are employed in the calculation of the photoelectron continuum wave functions. Cross sections and asymmetry parameters for photoionization of the NH ground state leading to the X 2Π, a 4Σ−, and A 2Σ− ions are also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459369
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  • 4
    Electronic Resource
    Electronic Resource
    Rotationally resolved near-threshold photoionization of the 1b1 valence orbital of H2O and D2O (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 3108-3114 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Results of theoretical studies of rotationally resolved ion distributions for near-threshold photoionization of the 1b1 valence orbital of H2O and D2O are reported and compared with measured spectra. Agreement between the calculated and measured spectra is very encouraging. The calculated and measured spectra reveal both type a and type c transitions in contrast to type c transitions only expected in an atomiclike picture. Type a transitions arise from odd (mainly p wave) angular momentum components of the photoelectron matrix elements which are due to l mixing in the electronic continua. These type a transitions are quite molecular in origin and are similar to nonatomiclike transitions seen in resonance enhanced multiphoton ionization of excited states of diatomic molecules. Useful rotational selection rules are also obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462998
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  • 5
    Electronic Resource
    Electronic Resource
    Rotationally resolved threshold photoelectron spectra of OH and OD (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 768-772 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The results of combined experimental and theoretical studies of the rotationally resolved photoelectron spectra of OH and OD following single-photon ionization are presented. The measured zero-kinetic-energy (ZEKE) spectra were obtained using pulsed field ionization in conjunction with a vacuum ultraviolet laser source. The OH+ and OD+ (X 3Σ−, v+=0) rotational distributions were studied over the range 95.0–95.4 nm. Agreement between the observed and calculated spectra is very encouraging. Improved values for the ionization potentials of OH and OD (104 989 and 105 085±2 cm−1, respectively) are reported and the unusual dynamics favoring ΔN〈0 transitions are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463179
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  • 6
    Electronic Resource
    Electronic Resource
    Rotational branching ratios and photoelectron angular distributions in resonance enhanced multiphoton ionization of diatomic molecules (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 4977-4985 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this paper we extend a previous formulation of molecular resonance enhanced multiphoton ionization (REMPI) photoelectron spectra to explicitly include multiplet-specific final state wave functions and intermediate coupling schemes. The results of this formulation should be well suited and helpful in quantitative theoretical studies of rotationally resolved REMPI spectra in many diatomic molecules of interest. As an example, we use this formulation to study the rotational branching ratios and photoelectron angular distributions for (3+1) REMPI of NH via the 3 3Π Rydberg resonant state. The predicted anomalous rotational distributions are interpreted as arising from a Cooper minimum in the l=2 component of the kπ photoionization channel. A number of other results are obtained and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461793
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  • 7
    Electronic Resource
    Electronic Resource
    Rotationally resolved photoelectron spectra in resonance enhanced multiphoton ionization of SiF (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 5489-5496 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Results of calculations of rotationally resolved photoelectron spectra for resonance enhanced multiphoton ionization (REMPI) of SiF via the B 2Σ+ (4sσ), C‘ 2Σ+ (4pσ), and C' 2Π (4pπ) Rydberg states are reported. In addition to the expected ΔN=even peaks, unusually strong ΔN=±1 transitions are predicted for photoionization of the B 2Σ+ state. These unusual transitions are due to even angular momentum components of the photoelectron matrix element and arise from the formation of Cooper minima in the ionization channels and strong l mixing in the electronic continuum induced by the nonspherical molecular ion potential. Unexpected ΔN=0,±2 transitions, due to odd wave contributions to the photoelectron matrix element, are also predicted for photoionization of the C‘ 2Σ+ state. Asymmetrical ion distributions with respect to ΔN=0 are also predicted for the C' 2Π state. Cooper minima are predicted to occur in the l=2 wave of the kπ photoelectron channel for the B state and in the l=4 wave of the kσ and kπ channels for the C‘ state. Photoelectron angular distributions provide further insight into the photoionization dynamics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463782
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  • 8
    Electronic Resource
    Electronic Resource
    Rotationally resolved photoelectron spectra in resonance enhanced multiphoton ionization of H2O via the C 1B1 Rydberg state (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 3905-3913 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this paper, we extend a previous formulation of molecular resonance enhanced multiphoton ionization (REMPI) photoelectron spectra of diatomic molecules to treat rotationally resolved photoionization of nonlinear polyatomic molecules. Useful parity selection rules, which govern changes of angular momenta ΔKa and ΔKc, are also derived. As an example, we use this formulation to study rotational branching ratios and photoelectron angular distributions resulting from (3+1') REMPI of H2O via the C 1B1 (3pa1) Rydberg state. Cooper minima are predicted to occur in the d wave (l=2) of the ka1 (λ=0) and kb1 (λ=1) photoelectron continua. The effects of these Cooper minima on rotationally resolved photoelectron spectra are also investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462929
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  • 9
    Electronic Resource
    Electronic Resource
    Rotationally resolved photoelectron spectra in resonance enhanced multiphoton ionization of Rydberg states of NH (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 211-221 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Results of combined theoretical and experimental studies of photoelectron spectra resulting from (2+1) resonance enhanced multiphoton ionization (REMPI) via the f 1Π(3pσ), g 1Δ(3pπ), and h 1Σ+(3pπ) Rydberg states of NH are reported. The overall agreement between these calculated and measured spectra is encouraging. Strong ΔN=N+−N'=even peaks, particularly for ΔN=0, are observed in these spectra. Low-energy Cooper minima are predicted to occur in the l=2 wave of the kπ(1Σ+), kπ(1Σ−), and kπ(1Δ) photoelectron channels for the f state, the kπ(1Δ), kδ(1Π), and kδ(1Φ) channels for the g state, and the kπ(1Σ+) and kδ(1Π) channels for the h state of NH. Depletion of the d wave (l=2) contributions to the photoelectron matrix element in the vicinity of these Cooper minima subsequently enhances the relative importance of the odd l waves. The observed ΔN transitions are also affected by strong l mixing in the electronic continuum induced by the nonspherical molecular potential. Interference of continuum waves between degenerate ionization channels also determines the spectral pattern observed for photoionization of the f 1Π state of NH. Photoelectron angular distributions and the angular momentum compositions of photoelectron matrix elements provide further insight into the origin of these Cooper minima.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463619
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  • 10
    Electronic Resource
    Electronic Resource
    Rotational branching ratios and photoelectron angular distributions in resonance enhanced multiphoton ionization of HBr via the F 1Δ2 Rydberg state (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 7872-7879 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Results of theoretical studies of rotational ion distributions in the X 2Π1/2 ground state of HBr+ resulting from (2+1) resonance enhanced multiphoton ionization (REMPI) via the S(2) branch of the F 1Δ2 Rydberg state are reported. These results show a strongly parity-favored ion distribution with about 80% population in the (−) component of the Λ doublet of J+ rotational levels. The 20% population in the other parity component of the Λ doublet can be seen to be due to odd partial wave contributions to the photoelectron matrix elements which arise primarily from non-atomic-like behavior of the electronic continuum. This, in turn, is due to angular momentum coupling in the photoelectron orbital brought about by the torques of the nonspherical molecular ion potential. We demonstrate that the effect of alignment on these ion distributions, although not large, is important. Photoelectron angular distributions and alignment of the J levels of the HBr+ ions are also presented. Rotational branching ratios and photoelectron angular distributions resulting from (2+1') REMPI of HBr via several S branches of the F 1Δ2 state are also shown for near-threshold photoelectron energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461316
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