Laser-induced fluorescence from weakly bound states of KI

Chévrier, P.; Collings, B. A.; Das, Puspendu K.; Polanyi, J. C.; Prisant, Michael G.; Visticot, J. P.

doi:10.1016/0301-0104(89)80096-5

Cited by 4 publications

(1 citation statement)

References 42 publications

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“…3 15 while some of the upper electronic states of the molecule have covalent bonds. 16 Due to lack of RKR and ab initio data on the intramolecular potential of the ground electronic state of the KI molecule ͑the potential is known only in the region of its minimum 17,18 ͒, we approximated the Tietz-Hua and Morse intramolecular potentials of the molecule by a truncated Rittner potential 19 ͑the latter potential is one of the most accurate model potentials for the ionic bonds of the alkali halides molecules 20 ͒. In the case of the two upper electronic states of ICl, we approximated the bottom part of each of the potentials by the potential of the harmonic oscillator; such a procedure allows one to obtain the vibrational constant e , and ͑through the Birge-Sponer relationship͒ the molecular anharmonicity constant e x e ͑both constants are not available in the literature͒.…”

Section: Rotational-vibrational Eigenvaluesmentioning

confidence: 99%

Statistical–mechanical calculations of thermal properties of diatomic gases

Gordillo‐Vázquez

Kunc

1998

Journal of Applied Physics

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The impact of rotational-vibrational dynamics of molecules on the molecular partition functions, law of mass action and thermodynamic functions of partially dissociated diatomic gases is discussed. A group of 11 gases, expected to have their partition functions the most sensitive to the molecular rotational-vibrational properties, is selected for rigorous and detailed studies, and the partition functions, dissociation degrees and free energies of the gases are calculated ͑using various models of molecular rotational-vibrational dynamics͒ and compared in a broad range of temperature and particle density.

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Section: Rotational-vibrational Eigenvaluesmentioning

confidence: 99%

Statistical–mechanical calculations of thermal properties of diatomic gases

Gordillo‐Vázquez

Kunc

1998

Journal of Applied Physics

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Resonance ionization mass spectroscopy of atomic products formed by photodissociation of sodium iodide molecules

Collier¹,

Telle²

1993

Rapid Comm Mass Spectrometry

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The products produced by photofragmentation in a molecular beam of sodium iodide, NaI, are investigated utilizing the technique of resonance ionization spectroscopy for the metal fragment, Na. Time-of-flight mass spectra are recorded, as a function of the wavelength of the resonant excitation step, and in dependence of the laser pulse energy. In particular, the appearance of non-resonantly generated atomic and molecular ions is discussed, highlighting the importance of mass-selective analysis of the ions formed in the interaction volume of the laser and molecular beams.The method of resonance ionization spectroscopy, (RIS), was introduced in the early 1970s for the ultrasensitive detection of atoms. As the name implies, in the technique ions have to be detected; since the collection of ions is usually considerably more sensitive and efficient than collecting photons, RIS is, under certain circumstances, superior to methods based on light detection, like for example, laser-induced fluorescence. Since its early days, the technique of resonance ionization has now developed into a tool which is successfully used in numerous spectroscopic and analytical applications. In particular, this is true when the technique is used for the detection and analysis of molecules; for molecules a variant of the original approach is often employed, namely resonance enhanced multi-photon ionization (REMPI). One of the many examples is the resonance enhanced 2 + 1 multi-photon ionization of molecular halides, X,; the process has been extensively investigated for I, (for example, by Donovan and co-workers). ' The addition of a mass spectrometer to the basic resonance ionization arrangement gives rise to the method of resonance ionization mass spectrometry (RIMS). Using a mass spectrometer, the selectivity provided by the laser excitation/ionization can be improved since one can suppress background ions. For example, unwanted ions may be generated in the sample volume by non-resonant multi-photon ionization when the power density of the laser radiation is sufficiently large. In particular, such unwanted ions may swamp the desired signal if the species under investigation is only a minor constituent of the particles in the interaction volume.Furthermore, ions may also be generated by predissociation of ion-pair states, as is the case for molecular halides. I2 is an example, and when excited near (below and above) its ionization limit, mass analysis reveals a differing ratio between atomic I + and molecular I; ions as a function of laser wavelength (see for example, the work of Wu and Johnson).' This ratio can be used to reveal information about the structure of its molecular levels. Author to whom correspondence should be addressed.larger molecules, for example methyl iodide, using tunable laser r a d i a t i~n .~ Time-of-flight mass spectra reveal differing amounts of various fragments CH; , CH+, C+ and I + , as well as the parent ion CH31+, when the laser wavelength is changed. In this work we describe an experiment in which alkali hal...

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Photodissociation Dynamics : State selection and beyond

Das¹

1991

Reaction Dynamics

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Laser-induced fluorescence from weakly bound states of KI

Cited by 4 publications

References 42 publications

Statistical–mechanical calculations of thermal properties of diatomic gases

Statistical–mechanical calculations of thermal properties of diatomic gases

Resonance ionization mass spectroscopy of atomic products formed by photodissociation of sodium iodide molecules

Photodissociation Dynamics : State selection and beyond

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