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  • 1
    Electronic Resource
    Electronic Resource
    Bound–free 1 3Π→1 3Σ+ emission from the NaK molecule: Determination of the 1 3Σ+ repulsive wall above the dissociation limit (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 5801-5813 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the observation of bound–free emission on the 1 3Π→1 3Σ+ band of the NaK molecule. The spectra, which consist of oscillating continua in the near-infrared, have been analyzed to determine parameters describing the repulsive wall of the 1 3Σ+ state above the dissociation limit. Spectra calculated using a potential of the form Ae−BR +C for the 1 3Σ+ state were compared to experimental spectra to yield the following values: A=5.94×105 cm−1, B=1.605 A(ring)−1, C=−220.520 cm−1. This potential, which is referenced to the bottom of the RKR 1 3Σ+ well (De =209.1 cm−1), is valid over the range R=3.4–4.5 A(ring) (R=6.4–8.5 a.u.). The relative transition dipole moment of the 1 3Π→1 3Σ+ band has also been determined over a limited range in R (7.5〈R〈8.9 a.u.) through the study of relative intensities of various maxima within each oscillating spectrum. In the simulated spectra, the dipole moment was represented by a functional form D(R)=m(R−R0)+D0 where D0 was used to normalize the results to a recent theoretical calculation (D0=1.07 a.u. R0=8.034 a.u.). The best fit for the parameter m was determined to be 0.121±0.029 in atomic units.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458400
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  • 2
    Electronic Resource
    Electronic Resource
    Nonadiabatic g–u mixing of the F 1Σg+ and 2 1Σu+ states of 6Li7Li (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 10805-10810 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Transitions from the A 1Σu+ (v=4, J=11 and 9) level to the F 1Σg+ (v=3, J=10) and 2 1Σu+ (v=2, J=10) levels of the 6Li7Li molecule, were observed using Doppler-free two-step polarization labeling spectroscopy. The intensity ratio of the two transitions was approximately 150:1. The energy spacing between the deperturbed F 1Σg+ (v=3, J=10) and 2 1Σu+ (v=2, J=10) levels was calculated to be 0.11 cm−1. The 2 1Σu+←A 1Σu+ transition becomes allowed due to an interaction between gerade and ungerade states resulting from the mass difference of the nuclei. The interaction energy between the F 1Σg+ (v=3, J=10) and 2 1Σu+ (v=2, J=10) levels was calculated to be 0.009 cm−1 from an analysis of the deperturbed level energies and the ratio of the line intensities. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1374240
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular constants and Rydberg–Klein–Rees (RKR) potential curve for the Na2 1 3Σg− state (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 3494-3497 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Transitions into the doubly excited Na2 1 3Σg− state have been analyzed using near-dissociation expansions (NDE) to represent the vibrational energies and inertial rotational constants, while the centrifugal distortion constants were held fixed at "mechanically consistent" values calculated from the Rydberg–Klein–Rees (RKR) potential implied by those G(v) and Bv functions. The input data cover the range v=0 to 57 and N up to 47, and the fit yields vD=61.41(±0.10) and D0=3385.70(±0.2) cm−1. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479858
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  • 4
    Electronic Resource
    Electronic Resource
    The 2 3Πg and 3 3Πg states of 7Li2: Optical–optical double resonance spectroscopy and ab initio calculations (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 5898-5903 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The (2p+2p) 2 3Πg and (2s+3p) 3 3Πg states of 7Li2 have been studied both experimentally and theoretically. Vibrational levels v=0–41 of the 2 3Πg state and v=6–10 of the 3 3Πg state have been observed by perturbation facilitated optical–optical double resonance (PFOODR) spectroscopy. Our ab initio calculations show that the 2 3Πg state, although dissociating into 2p+2p atomic limit, is a Rydberg state and strongly mixed with the (2s+3p) 3 3Πg and (2s+3d) 4 3Πg Rydberg states. Our theoretical calculations show good agreement with our experimental results. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470469
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  • 5
    Electronic Resource
    Electronic Resource
    Perturbation facilitated optical–optical double resonance spectroscopy of the 2 3Σ+g, 3 3Σ+g, and 4 3Σ+g Rydberg states of 7Li2 (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 3024-3031 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper reports the experimental observation of the 2 3Σ+g, 3 3Σ+g, and 4 3Σ+g states of 7Li2 by cw perturbation facilitated optical–optical double resonance spectroscopy. Molecular constants and RKR potential curves have been obtained. Our experimental Te and Re for the 2 3Σ+g state are 27 297.45(16) cm−1 and 3.0797(18) A(ring), respectively, and for the 3 3Σ+g state are 31 043.93(53) cm−1 and 3.0378(19) A(ring), respectively. The above values are in very good agreement with theoretical calculations. Hyperfine splitting for both states has been resolved. Both states follow Hund's case (bβS) hyperfine coupling scheme. The experimental Fermi contact parameter, bF, is approximately 96±2 MHz for the 2 3Σ+g state and 95.6±3 MHz for the 3 3Σ+g state. These values are in good agreement with the previously obtained value 98.6±4 MHz [Li et al., J. Chem. Phys. 96, 3342 (1992)]. One level of the 4 3Σ+g state has been observed and its hyperfine structure has been resolved and characterized with Hund's coupling case (bβS). © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468612
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  • 6
    Electronic Resource
    Electronic Resource
    Doubly excited 1 3∑−g state of Na2: Observation and calculation (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 7213-7217 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The v=0–57 levels of the 3p+3p doubly excited 1 3∑−g state of Na2 have been observed by pulsed perturbation facilitated optical–optical double resonance (PFOODR) fluorescence excitation spectroscopy. The Tv=57=39 943.5 cm−1 of the 1 3∑−g state is 385 cm−1 above the X 2∑+g v+=0, J+=0 ionization threshold and 9 cm−1 below the Na (3p,2P3/2)+Na(3p,2P1/2) dissociation limit. No significant line broadening was observed above the X 2∑+g v+=0, J+=0 ionization threshold with our resolution. Molecular constants and the Rydberg–Klein–Rees (RKR) potential curve have been obtained from the observed data. The major constants are Te=36 519.13(17) cm−1, ωe=93.635(41) cm−1, and Be=0.118 95(90) cm−1. We have carried out an all-electron ab initio calculation for the 1 3∑−g state and transition dipole moment for the 1 3∑−g↔b 3Πu system of Na2. Molecular constants calculated from our ab initio potential curve have reasonable agreement with the experimental constants. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470349
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  • 7
    Electronic Resource
    Electronic Resource
    Study of the 4 1Σ+g "shelf'' state of Na2 by optical–optical double resonance spectroscopy (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 4756-4764 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Due to an avoided crossing, the 4 1Σ+g state of Na2 has an unusual potential energy curve with a "shelf'' on its outer wall. By using optical–optical double resonance techniques, vibrational levels from v=0 to 130 have been observed and the shelf was found around v=48–60. From the experimental data we have successfully constructed a Rydberg–Klein–Rees (RKR) potential curve, which can reproduce measured data with a standard deviation of 0.064 cm−1. A set of Dunham coefficients was obtained for the lower part v=0–45 of that state. Several interesting effects related to the shelf, such as the unusual behavior of Bv and Dv, of the vibrational wave functions and the semiclassical vibrational periods, and of the rotational effective potential, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460560
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  • 8
    Electronic Resource
    Electronic Resource
    The doubly excited 1 3Σ−g state of 7Li2 (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 3581-3587 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper reports the first experimental observation of the doubly excited valence (2p+2p)3Σ−g state of 7Li2. We used cw perturbation-facilitated optical–optical double resonance (PFOODR) fluorescence excitation and resolved fluorescence spectroscopic techniques. All the observed levels have been detected through perturbations by the 2 3Πg state. The deperturbed primary molecular constants of this 1 3Σ−g state are Te=34 045.354(43) cm−1, ωe=216.820(37) cm−1, Be=0.673 69(47) cm−1, Re=2.670 81(94) A(ring), and De=4279.306(43) cm−1. The equilibrium internuclear distance of the 1 3Σ−g state is smaller than that of the X 1Σ+g ground state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467543
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of the long-range potential and dissociation energy of the 1 3Δg state of Na2 (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 7240-7254 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The 1 3Δg state of Na2 has been studied extensively by both filtered fluorescence and ionization detection and analyzed by both Dunham-type expansion and near-dissociation expansion (NDE) models in the analysis. Our observations have covered 99.998% of the potential well depth with the outermost Rydberg–Klein–Rees (RKR) turning point at 28.02 A(ring). NDE analysis gives Te=28 032.468 (±0.021) cm−1, De=7162.436 (±0.021) cm−1, and Re=3.463 81 (±0.000 28) A(ring). Significant long-range behavior in the near dissociation levels has been observed. Fitting of the RKR turning points gives the long-range coefficients C5=1.388 (±0.031)×106 cm−1 A(ring)5 and C6=0.4008 (±0.0046)×108 cm−1 A(ring)6. These newly observed results show reasonable agreement with recent theoretical calculations. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470299
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  • 10
    Electronic Resource
    Electronic Resource
    Predissociation of the Na2 4 3Σg+ state (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 7707-7712 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Na2 4 3Σg+ state dissociates adiabatically to the 3s+4p atomic limit. The vibrational levels of the 4 3Σg+ state below the 3s+3d atomic limit were observed previously by perturbation facilitated optical–optical double resonance (PFOODR) fluorescence excitation spectroscopy. Vibrational levels above the 3s+3d atomic limit are found to be predissociated and transitions into these levels have been observed by detecting atomic Na 3d→3p fluorescence. The predissociation is due to the interaction with the continuum of the 2 3Πg state (direct as well as accidental predissociation via bound vibrational levels of the 3 3Πg state). The potential energy curve of the 4 3Σg+ state has been constructed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476206
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