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  • 1
    Electronic Resource
    Electronic Resource
    Perturbation analysis of the B 1Π state of 23Na85Rb molecule (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 811-817 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A number of the rovibrational levels of the B 1Π state are found to be strongly perturbed. The energy shifts of the e and f levels of the B 1Π state are studied, and the perturbations between the B 1Π and (2) 3Σ+ states and between the B 1Π and (1) 3Π1 states are identified. Forty-seven centers of perturbation are observed, and the molecular constants of the (2) 3Σ+ and (1) 3Π1 states are estimated. The hyperfine splitting of the (2) 3Σ+ state is observed. Each rovibrational level splits primarily into four lines, and each of the four lines splits into six lines. The splitting is identified as originating from the magnetic dipole interaction primarily with the nuclear spin of 23Na (I=3/2) and secondarily with the nuclear spin of 85Rb (I=5/2).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463183
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  • 2
    Electronic Resource
    Electronic Resource
    Hyperfine structure of the NaK c 3Σ+ state and the effects of perturbation (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 6423-6432 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Scanning the frequency of a single-mode dye laser crossed with a molecular beam of NaK, we have measured the excitation spectrum by monitoring selectively the fluorescence intensity of transition to the a 3Σ+ state. The B 1Π(v=8) and c 3Σ+(v=22) levels are perturbed around J=5 and the c 3Σ+(v=22) and b 3Π(v≈62) levels are perturbed around J=24. The transition lines to the perturbed levels are fully resolved. The hyperfine splitting, which is induced by the coupling with the nuclear spins of the Na and K atoms, is observed for levels of the c 3Σ+ state and the perturbed states. The magnitude of the hyperfine splitting, the line intensity, and the energy shift are analyzed, and their relation with the perturbation is studied. The ratio of electron spin densities at the sodium and potassium atoms in the c 3Σ+ state is estimated to be 0.71:0.15 from the magnitudes of hyperfine splitting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462856
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  • 3
    Electronic Resource
    Electronic Resource
    High resolution laser spectroscopy of the B 1Π–X 1Σ+ transition of 23Na85Rb (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 6229-6237 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: High resolution spectrum of the B 1Π–X 1Σ+ transition of the NaRb molecule was measured with the technique of the Doppler-free laser polarization spectroscopy. Molecular constants of the B 1Π(v=0–12) and X 1Σ+(v=0–6) states of 23Na85Rb were determined. The energy levels of the B 1Π state were found to present many irregularities due to perturbations. The resonance fluorescence spectrum following an excitation to a strongly perturbed level was measured. The fluorescence to the (1)3Σ+ state, which consists of discrete lines followed by a continuum band, was observed in addition to the fluorescence lines to rovibrational levels of the X 1Σ+ state. The perturbing state to the B 1Π(v=8,J=15–21) levels is identified as the (1)3Π state by comparing the observed fluorescence spectra with the selection rules for perturbations and radiative transitions. The dissociation limit of the (1)3Σ+ state, which separates into the Na(3s2S1/2)+Rb(5s2S1/2) atoms, was deduced from the spectrum. The dissociation energies of the X 1Σ+, (1)3Σ+, and B 1Π states were determined to be 5030±2, 182±2, and 1319±2 cm−1, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461569
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  • 4
    Electronic Resource
    Electronic Resource
    Perturbations of the A 1Σ+u and b 3Πu states of Na2 and the effects on the transition intensity and the line splitting (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 653-659 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Doppler-free polarization spectra of the A 1Σ+u (v=8, J=0–15) and b 3Π0u (v=14, J=0–15) states were observed. By analyzing the energy shifts, the spin–orbit interaction between the A 1Σ+u (v=8) and b 3Π0u (v=14) states was studied. The magnitudes of the hyperfine splittings were different in corresponding lines of the two states. In addition to the energy shifts, the line intensities and the line shapes were found to change remarkably near the perturbation. These are useful to study the mixing of the perturbing states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455240
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  • 5
    Electronic Resource
    Electronic Resource
    Doppler-free spectrum of the B 1Π–X 1Σ+ transition of NaK, and the perturbation and hyperfine splitting (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 7049-7055 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Doppler-free high-resolution spectrum of the B 1 Π–X 1Σ+ transition of NaK was measured by the technique of laser polarization spectroscopy. The molecular constants of the B 1 Π state, which reproduced the observed 831 unperturbed line positions (v=0–6, J=1–94) with a standard deviation of 0.002 cm−1 , were determined. Many perturbed lines, which were attributed to the perturbation between the B 1 Π and c(2) 3 Σ+ states, were observed. By analyzing the energy shifts of the B 1 Π(v=4,J) levels around J=13, we estimated the rotational constant Bv of the c(2) 3 Σ+ state to be 0.048 cm−1, and the matrix element of the spin-orbit interaction 〈c(2) 3 Σ+ vN=JJM||Hso|| B 1Πv=4JM〉 to be 0.14 cm−1 . We found that the strongly perturbed lines split into four lines, and we identified them as a hyperfine splitting caused by a mixing of the c(2) 3 Σ+ state. The splitting into four lines is explained by the magnetic dipole interaction due to a nucleus of I=3/2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455334
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of magnetic field on the perturbation between the B 1Π and c 3Σ+ states of NaK (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 955-960 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Zeeman spectra of the strongly perturbed lines between the B 1Π and c 3Σ+ states of NaK were measured by the Doppler-free laser polarization spectroscopy. Magnetic field dependence of the Zeeman pattern was studied and the line shapes were found to change remarkably because of the mixing of the B 1Π and c 3Σ+ states. The patterns of Zeeman splitting were found to be different depending on whether the level was located on the high energy side or the low energy side of the interacting level. The observed Zeeman spectra were studied by taking account of the spin–orbit, hyperfine, and Zeeman interactions. The Zeeman spectroscopy is shown to be useful to analyze the perturbation between the excited states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462115
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  • 7
    Electronic Resource
    Electronic Resource
    Coupled channel treatment of transitions between Na(2P1/2,mj) and Na(2P3/2,mj′) in collision with Na(2S1/2,mj″) (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 7423-7432 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Transitions between the Zeeman substates of Na(3p 2P1/2) and Na(3p 2P3/2) in collision with Na(3s 2S1/2) in thermal energy region are investigated by the close-coupling method. Rotational and spin–orbit couplings are taken into consideration, and potential energy functions generated by a quantum chemical calculation are employed. The cross sections strongly depend on the magnetic quantum numbers of the initial and final states. This dependence qualitatively coincides with an experimental observation in the presence of a weak magnetic field, although the magnetic field is not considered in the present calculation. Total cross section of the transition Na(2P3/2)→Na(2P1/2) is calculated to be 2.7×102 A(ring)2 in good agreement with experiment. The following two mechanisms are found to dominantly contribute to the total cross section: (1) Transitions among the molecular states of Na2, 3Π2u↔3Π1u and 3Π1u↔3Π0u, induced by the spin–rotation coupling, and (2) the transition, 1Σ+0g↔1Π1g induced by the Coriolis coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462392
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  • 8
    Electronic Resource
    Electronic Resource
    High resolution laser spectroscopy of the B 1Π−X 1∑+ transition of 23Na39K, and the perturbation between the B 1Π and c 3∑+ states (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 2228-2237 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Doppler-free laser polarization spectrum of the B1Π −X1∑+ transition of 23Na39K was measured, and the molecular constants of the B1Π state of v=0∼16 were determined. The perturbation between the B1Π(v=8) and the c3∑+(v=22) levels at small J were studied in detail. By comparing the observed line intensities of the B1Π(v=16, J=14) −X1∑+(v‘=0∼50, J=13 and 15) transition with the calculated Franck–Condon factors, the dependence of the transition dipole moment on the internuclear distance was determined. Absolute vibrational numbering of the c3∑+ state was done by comparing the calculated Franck–Condon factors with the observed line intensities of the c3∑+ −a3∑+ transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459056
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  • 9
    Electronic Resource
    Electronic Resource
    High resolution laser spectroscopy up to the dissociation limit of the NaK B 1Π state, and predissociation near the dissociation limit (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 7713-7720 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Doppler-free high resolution spectrum of the B 1Π(v',J')–X 1Σ+(v‘,J‘) transitions of 23Na39K was measured by the optical–optical double resonance (OODR) polarization spectroscopy. The transition lines up to the v'=43 level, which was estimated to be 1.8 cm−1 below the dissociation limit, were observed. The potential energy curve for internuclear distance from 3.25 to 15.6 A(ring) was calculated by the RKR method, and the inverse-power coefficient was determined by analyzing the long-range RKR turning points. The B 1Π state dissociates to Na(3s2S1/2)+K(4p2P3/2) atoms without a potential hill near the dissociation limit. The dissociation energy was determined to be 1324.3±0.3 cm−1 from the LeRoy–Bernstein plots. Remarkable line broadenings were observed for transitions higher than the dissociation energy to Na(3s2S1/2)+K(4p2P1/2) atoms. This is identified as originating from the predissociation to Na(3s2S1/2)+K(4p2P1/2) atoms. The predissociation is shown to be caused by a spin–orbit interaction between the B 1Π and (2)3Σ+ states, and the potential curves are expected to cross around the inner turning point of the B 1Π (v'=34) level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460157
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  • 10
    Electronic Resource
    Electronic Resource
    Predissociation of the Cs2 C 1Πu state (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 4637-4641 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: By scanning the frequency of a single-mode dye laser crossed to a molecular beam of Cs2, we measured the excitation spectra of the C 1∏u–X 1∑+g transition by detecting selectively the molecular fluorescence and the emission from the dissociated Cs(62P3/2) atoms. Dependence of the predissociation on each vibrational and rotational level C 1∏u (v,J) is studied by comparing the intensities of molecular fluorescence and atomic emission. This predissociation is found to depend strongly on the vibrational quantum number v but weakly on the rotational quantum number J, and to occur most strongly around the v=3 level. The Franck–Condon factors between the RKR potential curve of the C 1∏u state and several repulsive potential curves are calculated, and are compared with the observed predissociation rates. The potential curve of the (2)3∑+u state, which is expected to be repulsive and to cause the predissociation through the spin–orbit interaction, is estimated to cross the potential curve of the C 1∏u state between the left turning points of v=1 and v=0 levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458703
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