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  • 1
    Electronic Resource
    Electronic Resource
    Vibronic analyses of the mass-resolved NeXe spectra near Xe*(6p) (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 4817-4826 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: New mass-resolved two-photon spectra of NeXe involving molecular Rydberg states that dissociate to Ne+Xe*(6p) have been recorded using the combined techniques of (2+1) resonance enhanced multiphoton ionization and time-of-flight mass spectrometry. Excited state symmetries were deduced from separate spectra recorded with linearly and circularly polarized light. Vibronic analyses show that most of the excited states in this spectral region are essentially repulsive except for shallow minima whose electronic origins lie above their asymptotic dissociation limits. The magnitude of the potential humps for the excited states have been estimated. These results are rationalized in terms of an excited state bonding scheme that is dominated predominately by the interplay between repulsive exchange interactions and attractive long-range forces. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474845
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  • 2
    Electronic Resource
    Electronic Resource
    Mass-resolved two-photon spectra of Xe2 in the region of Xe*(5d). II. Dominant ion-core assignments by dispersive photoelectron spectroscopy (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 9419-9426 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: New dispersive photoelectron spectra have been used to identify the dominant ion cores associated with the XeXe*(5d) Rydberg states analyzed in the preceding paper. These results, for the most part, confirm predictions made from angular momentum arguments. Evidence for excited state predissociation and perturbations are also presented. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474113
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  • 3
    Electronic Resource
    Electronic Resource
    Optical spectroscopy of plasma produced by laser ablation of Ti alloy in air (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 1783-1786 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-resolved emission spectrum from the plasma produced by 1.06 μm, 10 ns pulsed-laser irradiation of titanium alloy targets in air at a flux of 9.3×109 W cm−2 was analyzed in the wavelength range of 2000–8800 A(ring). From the evolutions of the specific spectrum lines of N II, Ti I, and Fe I, the velocities of N+ ions and the excited neutral Ti and Fe atoms have been obtained using a time-of-flight diagnostic method. The electron temperatures were deduced using the relative emission intensities of N II and Fe I isolated spectrum lines, and an electron number density was determined from the Stark-broadened line of the N II line at wavelength λ=3995 A(ring). © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362988
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetism in URhSi : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5221-5223 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Our neutron-powder-diffraction experiment revealed that URhSi crystallizes in the orthorhombic TiNiSi (space group Pnma) structure and orders ferromagnetically at low temperatures with the U magnetic moments of 0.11 μB aligned along the c axis. Anomalies in the temperature dependence of the magnetic susceptibility, specific heat and electrical resistivity indicate that URhSi orders below 9.5 K. The enhanced Cp/T value (extrapolated to 0 K) of 186 mJ/mol K2 can be partially reduced in magnetic fields, which indicates a considerable magnetic contribution even at very low temperatures. The ferromagnetic ground state is documented also by magnetization measurements at low temperatures. The high-field magnetization data obtained on oriented powder reveal a strong magnetocrystalline anisotropy. All the results obtained on polycrystalline samples classify URhSi as an itinerant 5f ferromagnet with very reduced U magnetic moments. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361347
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  • 5
    Electronic Resource
    Electronic Resource
    Electronic properties of U2Pt2Sn : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6361-6363 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: U2Pt2Sn is crystallizing in an ordered version (space group P42/mnm) of the tetragonal U3Si2 type of structure. Clear anomalies in the magnetic susceptibility, specific heat, and electrical resistivity around 15 K indicate that U2Pt2Sn orders antiferromagnetically below this temperature. As expected for an antiferromagnet, the susceptibility and specific heat anomalies are shifted to lower temperatures upon application of external magnetic field. The specific-heat coefficient γ=327 mJ/mol f.u. K2 remains unchanged in fields up to 5 T. The antiferromagnetic ground state of U2Pt2Sn can be concluded also from the metamagnetic transition around 22 T in the magnetization at 4.2 K and from magnetic reflections in the neutron-diffraction pattern at low temperatures. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362000
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  • 6
    Electronic Resource
    Electronic Resource
    Heteronuclear rare-gas dimer bonding: Understanding the nature of the Rydberg states that dissociate to the highest energy level of the Xe*(5d) manifold (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 2985-2990 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: (1+1′) resonance enhanced multiphoton ionization (REMPI) spectra of jet-cooled KrXe and ArXe in the vicinity of the high energy Xe*5d[3/2]10←Xe(1S0) atomic line at 83889.99 cm−1 were obtained by exciting the neutral dimers with tunable coherent vacuum ultraviolet (VUV) radiation generated by four-wave sum mixing in mercury vapor, and then detecting the resultant ions in a time-of-flight (TOF) mass spectrometer. Precise excited state constants were derived from analyses of the resultant vibrational fine structure, while equilibrium bond lengths were estimated from Franck–Condon factor intensity simulations. Excited state symmetries were deduced from separate ultraviolet (UV) (2+1) REMPI spectra recorded with linearly and circularly polarized light. The results of this work confirm a recent model proposed by Lipson and Field, where the RgXe*(5d) states are predicted to be strongly destabilized relative to RgXe*(6p) due to strong 5d-6p Xe* l-mixing induced by the ground state Rg atom partner making up the dimer. Orbital mixing is also responsible for the observation of appreciably strong RgXe*(5d) spectra in both one- and two-photon excitation. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479581
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  • 7
    Electronic Resource
    Electronic Resource
    Erratum: "Mass-resolved two-photon spectra of Xe2 in the region of Xe*(5d). II. Dominant ion-core assignments by dispersive photoelectron spectroscopy" [J. Chem. Phys. 106, 9419 (1997)] (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 5275-5275 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475330
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  • 8
    Electronic Resource
    Electronic Resource
    Mass-resolved two-photon spectra of Xe2 in the region of Xe*(5d). I. Vibronic analyses (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 9411-9418 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Eight band systems of jet-cooled Xe2 between 83 763.9 and 80 149.8 cm−1 involving gerade excited states that dissociate to Xe(1S0)+Xe*5d[3/2]10, Xe(1S0)+Xe*5d[5/2]30, Xe(1S0)+Xe*5d[5/2]20, Xe(1S0)+Xe*5d[7/2]30, Xe(1S0)+Xe*5d[7/2]40, and Xe(1S0)+Xe*6p[1/2]0 have been characterized using (2+1) resonance enhanced multiphoton ionization/time-of-flight mass spectrometry, many for the first time. Excited state vibrational numbering and constants, including dissociation energies were obtained from bandhead measurements made from separate single isotopomer spectra. Bond lengths were estimated from Franck–Condon factor intensity simulations, while excited state electronic symmetries were deduced primarily from polarization measurements. In three instances, energy barriers due to double well potential energy curve formation are identified. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473846
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  • 9
    Electronic Resource
    Electronic Resource
    Mass-resolved two-photon and photoelectron spectra of Xe2 in the Xe(4f) region above the first molecular ionization limit (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 3944-3953 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Two-photon resonance enhanced multiphoton ionization (REMPI), time-of-flight (TOF) mass spectrometry, and photoelectron spectroscopy have been used to investigate the gerade Xe2 Rydberg states located just above the first molecular ionization limit. Effective vibrational analyses are presented for five dimer states that dissociate to Xe+Xe*(4f ). The electronic symmetries of the band systems in this region were deduced from separate REMPI spectra recorded with linearly and circularly polarized laser light while excited state bond lengths were estimated from Franck–Condon intensity simulations. Two photoelectron signals were measured for each molecular resonance examined in this work. The strongest one, having a near zero kinetic energy, is attributed to dimer electrons released through autoionization. The weaker photoelectron signals corresponding to faster electrons originate from excited state Xe atoms formed by predissociation. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476994
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  • 10
    Electronic Resource
    Electronic Resource
    Mass-resolved two-photon spectra of ArXe in the region of Xe*(6p) (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 1213-1224 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: (2+1) resonantly enhanced multiphoton ionization (REMPI) spectra of ArXe have been recorded between ≈78 000 and 80 110.0 cm−1. Single isotopomer data was obtained using a time-of-flight (TOF) mass spectrometer. Vibrational analyses for several transitions involving ArXe excited states that dissociate to Ar(1S0)+Xe*(6p) are presented, in some instances, for the first time. In addition to vibrational numbering and constants, excited state symmetries were deduced from separate REMPI/TOF spectra recorded with linearly and circularly polarized light, while excited state bond lengths were derived from Franck–Condon factor calculations. Some of the excited states were found to have potential humps and/or unusual vibrational band intensity distributions. Where possible, the nature of the perturbations is discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470781
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