Isotope selective two-step photoionization study of K2 in a supersonic molecular beam

Leutwyler, Samuel; Herrmann, André; Wöste, L.; Schumacher, Ernst

doi:10.1016/0301-0104(80)80055-3

Cited by 71 publications

(7 citation statements)

References 30 publications

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“…2. The spectroscopic constants of the ground and the six first excited states are presented in Tables 3A and 3B and compared with the available works [16][17][18][19][20][21]. Table 4 is devoted only to our spectroscopic constants for the higher excited states studied here for the first time.…”

Section: Potential Energy Curves and Spectroscopic Constantsmentioning

confidence: 99%

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Theoretical investigation of the molecular structure and transition dipole moments of the NaK+ low lying electronic states

Ghanmi

Berriche

Ouada

2006

Journal of Molecular Spectroscopy

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Section: Potential Energy Curves and Spectroscopic Constantsmentioning

confidence: 99%

“…In spite of the relative simplicity of the NaK + system, most of the theoretical works [16][17][18][19][20][21] have been focused on the ground state. Mü ller and Meyer [17] have determined for NaK + the spectroscopic constants of only the ground state.…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigation of the molecular structure and transition dipole moments of the NaK+ low lying electronic states

Ghanmi

Berriche

Ouada

2006

Journal of Molecular Spectroscopy

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“…(8) This fact is important: The difference vj-\ -vj+ x may be an integer and keep this value during a few levels, so that a whole region of the spectrum satisfies Eq. (5). In this region, the spectra are strongly simplified, because J A lines are forbidden, the l U lines are much more intense than the l X ones, and the P, (?, R lines lie at the same energy.…”

Section: Stroboscopic Effect Between Electronic and Nuclear Motion Inmentioning

confidence: 99%

Stroboscopic Effect between Electronic and Nuclear Motion in Highly Excited Molecular Rydberg States

et al. 1984

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The Na2 Rydberg states have been observed for 15 ^ n ^ 90 and 4 ^ / ^ 45. The evolution of the spectra is studied as a function of the relative values of oo e i, the electronic rotational frequency, and OJ N , the nuclear rotational frequency. The molecular eigenfunction is found to be pure Hund's case a when ka) e \ = 2a> N (k being an integer). This may be explained in terms of stroboscopic effects arising from the movement of the Rydberg electron relative to the ionic core.PACS numbers: 33.80.Eh, 33.10.-n In highly excited molecular Rydberg states, the rotational frequency w el of the Rydberg electron in its orbital motion can become smaller than the rotational frequency a) N of the nuclei. Under these conditions, the Born-Oppenheimer approximation is no longer valid and the electron angular momentum 1 tends to be decoupled from the internuclear axis.The interpretation of these effects was rather involved, 1 until the experimental work of Herzberg and Jungen 2 on H 2 whose interpretation by quantum-defect theory was due to Fano. 3 However, in their experiment they observed only Rydberg levels with n ^ 40 and / = 0,1,2.Recently optical-optical double resonance 4 " 8 has proved to be a powerful technique to study molecular Rydberg states. Using this method we have observed Na 2 molecular Rydberg states for 15^ n ^ 90 and 4 ^ / ^ 45. These new results enable us to study in detail the molecular spectrum when o) el = A transitions is explained by the mixing of wave functions, due to A doubling. 9 As n increases, rotational perturbations become important, and the regular structure of the spectrum is lost. For the interpretation of these spectra we have used the multichannel quantum-defect theory introduced by Seaton, 10 and applied to molecular Rydberg states by Fano. 3 The theoretical aspects a...

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“…Other multiphoton techniques have rarely been used to study excited states of molecules. After the pioneering work of Schumacher et al [14], Leutwyler et al [15] * Humboldt Research Fellow 1986-1988, on leave from Institute of Experimental Physics, Warsaw University, Poland and Martin et al [16,17] have demonstrated that Rydberg states can be studied through autoionizing states excited in a supersonic molecular beam. More than 30 excited singlet and triplet S, //, and A gerade states of Na2 have been extensively studied by Schawlow and coworkers [5][6][7][8][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Rydberg states of the K2 molecule studied by laser spectroscopy in a supersonic beam

Kowalczyk

Schühle

Engelke

1989

Z Phys D - Atoms, Molecules and Clusters

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Rydberg states of potassium dimer have been studied in a crossed laser-molecular beam experiment. The K 2 molecules were formed in a supersonic expansion and excited by low-power cw dye laser. Two different excitation schemes have been used: The first scheme uses a single mode ring dye laser to induce near resonant two-photon transitions while in the second scheme stepwise excitation with two dye lasers is used. In each case excitation of Rydberg levels was detected by monitoring the ionization signal resulting from three-photon absorption. We report a detailed study of 700 two-photon resonances between 625 nm and 650 nm. Most of these signals can be assigned to transitions from the X 1Sg+ to 1Z~, 1Hg, a n d l a g states, which are all enhanced by the B 1H, intermediate state. Accurate rotational constants are given for the populated vibrational levels of these states. By stepwise excitation of Rydberg levels via the B 1H, state we identify 3 series of Rydberg states as aAg (4S+nD), 1~ (4S+nD), and 1S+ (4S + nS) with principal quantum numbers 7 < n <20. Molecular constants of these and other observed but as yet unidentified states are given; quantum defects and dissociation energies are discussed.

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Isotope selective two-step photoionization study of K2 in a supersonic molecular beam

Cited by 71 publications

References 30 publications

Theoretical investigation of the molecular structure and transition dipole moments of the NaK+ low lying electronic states

Theoretical investigation of the molecular structure and transition dipole moments of the NaK+ low lying electronic states

Stroboscopic Effect between Electronic and Nuclear Motion in Highly Excited Molecular Rydberg States

Rydberg states of the K2 molecule studied by laser spectroscopy in a supersonic beam

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