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  • 1
    Electronic Resource
    Electronic Resource
    Dynamics of Excited Molecules: Predissociation (1995)
    s.l. : American Chemical Society
    Chemical reviews 95 (1995), S. 2311-2349 
    Details
    ISSN: 1520-6890
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cr00039a003
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Intermolecular dynamics and exciplex formation of the 1-cyanonaphthalene/triethylamine van der Waals complex (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 2588-2596 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The exciplex formation dynamics of the 1-cyanonaphthalene/triethylamine van der Waals complex upon excitation has been examined under collision free conditions. Mode-specificity has been found in the excitation of a combination band between intra- and intermolecular vibrational modes in the S1 state of the vdW complex to promote the exciplex formation reaction. The specificity is lost at higher excess energies since randomization of energy among intermolecular modes is more extensive than the reaction rate. The fluorescence decays of the S1 and exciplex states have been measured as a function of excess vibrational energy above the S1 origin. The lifetime of the S1 state at the excess energy where the mode-specific reaction is observed is different from that of the exciplex fluorescence. As the excess energy increases, the decay rate of the S1 state shows a sharp increase due to the exciplex formation while the exciplex fluorescence rate remains constant. The observed decay rate constants have been discussed using a simple kinetic model which accounts for the mode-specific exciplex formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452061
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Hyperfine structure of the Na2 b 3Πu state (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 5124-5125 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The energy shifts and the hyperfine structures of the strongly perturbed levels between the A 1Σ+u (v=7) and b 3Π0u (v=13) states and between the A 1Σ+u (v=8) and b 3Π0u (v=14) states are studied. The hyperfine splitting of the Na2 b 3Πu state can be attributed predominantly to the Fermi contact interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457608
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  • 6
    Electronic Resource
    Electronic Resource
    Hyperfine and Zeeman quantum beats of the Na(3 2P3/2–3 2S1/2) transition, and the decay of coherence (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 5238-5242 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Quantum beats of the Na(3 2P3/2–3 2S1/2) transition and their change with the magnetic field were observed in pure Na vapor and Na+He gas by using a picosecond laser system. The energies of the hyperfine and Zeeman sublevels of the 3 2P3/2 and 3 2S1/2 states were calculated by using the reported hyperfine constants and g factors, and the theoretical curve of the quantum beats was calculated. The results were in good agreement with the observed profile of the quantum beats in phase of modulation, but the difference of the amplitudes increased with time. By comparing the amplitude of the theoretical curve of the quantum beats with that of the experimental curve, we determined the relaxation time of coherence. The decay of amplitude of the modulation was found to become faster as the pressure of the foreign gas (He) was increased. The decay of amplitude, i.e., the decay of coherence arises from the dephasing, which occurs from the fluctuation of the level energies induced by the interatomic interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456477
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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    Dynamics of Cs2 excited by a synchronously pumped mode-locked dye laser, and the effects of magnetic field (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 1987-1993 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: When the Cs2 molecule was excited by a dye-laser line of 15 841 cm−1, the fluorescence from the energy-transferred states as well as the resonance fluorescence fromthe optically excited levels, which were assigned to C 1Πu and d 3Πu, were observed. We measured the picosecond time-resolved fluorescence intensity by changing the vapor pressure and the temperature. The decay curves were analyzed by a least-squares curve fitting, and the lifetimes in the collisionless limit and the collision cross sections were determined. From the consideration of the rise and decay rates of fluorescence intensities, the kinetic pathways of the collisional energy transfer were estimated. The intensity of the fluorescence d 3Πu–X 1Σ+g was found to decrease appreciably in the presence of an external magnetic field. The magnetic field effect was estimated to be due to the predissociation induced by an electronic Zeeman interaction between the d 3Πu and c 3Σ+u states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453172
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  • 9
    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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  • 10
    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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