Negative Ion Spectroscopy

Corderman, Reed R.; Lineberger, W. C.

doi:10.1146/annurev.pc.30.100179.002023

Cited by 111 publications

(30 citation statements)

References 44 publications

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“…Since then, a large number of accurate EAs have been determined with this technique for atoms and molecules. Overviews have been given by several groups (Christodoulides et al, 1984;Hotop & Lineberger, 1985;Janousek & Brauman, 1979;Corderman & Lineberger, 1979) active in this area.…”

Section: Spectroscopic Methods Which Include Neutral 4 Anion Tranmentioning

confidence: 99%

Negative ions, mass selection, and photoelectrons

Boesl

Knott

1998

Mass Spectrom. Rev.

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Section: Spectroscopic Methods Which Include Neutral 4 Anion Tranmentioning

confidence: 99%

Negative ions, mass selection, and photoelectrons

Boesl

Knott

1998

Mass Spectrom. Rev.

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Section: Introductionmentioning

confidence: 99%

“…Alternatively, photodetachment of negative ions A-+hv~A+e (1) may be studied. With the development of laser light sources, detailed photodetachment experiments have become possible [1][2][3][4]. The photon energy dependence of the cross section can be investigated with sub-meV resolution, and high quality photoelectron spectra can be recorded for virtually every negative ion with sufficient lifetime [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Electron scattering from A and photodetachment of A-lead to the same kind of final states. Comparison between experiment and theory, however, is often simpler for photodetachment than for electron scattering because the conservation of angular momentum and parity permits the emission of only very few partial waves in (1). It is well known that correlation is dominant in negative ions.…”

Section: Introductionmentioning

confidence: 99%

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Partial cross sections for Rb? photodetachment in the region of the Rb(5p 2 P 1/2,3/2) thresholds and their analysis by multichannel quantum defect theory

et al. 1982

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A crossed ion-laser beam apparatus has been used to measure accurate relative total and partial cross sections for photodetachment from Rb-ions with high photon energy resolution (0.1-0.6 cm-1) in the region of the Rb(5p 2P~/2,3/2) thresholds (photon energy range 16,350-16,820cm-1). Satisfactory fits to these data by multichannel quantum defect theory (MQDT) have been obtained, resulting in a reliable set of seven MQDT parameters. The electron angular distribution parameter for the Rb(5s) channel was found to be/~(5s)=2, independent of photon energy. MQDT predicts a sharp, windowtype variation of /~(5s) around the minimum of the 5s-cross section below the Rb(5p 2P1/2) threshold (where an accurate experimental measurement of/~(5s) was not possible) and a similar behaviour of/?(6s) in the case of Cs-photodetachment below the Cs(6p 2P~/2) threshold.

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“…A number of methods exist for preparing molecules with large, well-defined, and controllable amounts of energy in electronic, translational, and vibrational degrees of freedom, but until recently, it has been much more difficult to exert control over the rotational energy of molecules (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14). Traditional methods for optically preparing rotationally hot molecules are limited by strict selection rules that constrain angular momentum changes to small values (15,16).…”

mentioning

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Dynamics of molecules in extreme rotational states

Yuan

Teitelbaum

Robinson

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

122

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We have constructed an optical centrifuge with a pulse energy that is more than 2 orders of magnitude larger than previously reported instruments. This high pulse energy enables us to create large enough number densities of molecules in extreme rotational states to perform high-resolution state-resolved transient IR absorption measurements. Here we report the first studies of energy transfer dynamics involving molecules in extreme rotational states. In these studies, the optical centrifuge drives CO 2 molecules into states with J ∼ 220 and we use transient IR probing to monitor the subsequent rotational, translational, and vibrational energy flow dynamics. The results reported here provide the first molecular insights into the relaxation of molecules with rotational energy that is comparable to that of a chemical bond.carbon dioxide | rotational dynamics | transient spectroscopy | high-energy molecules | strong optical fields C ontrol of molecular energy for use in chemical and physical transformations requires tools for exciting specific degrees of freedom in molecules. A number of methods exist for preparing molecules with large, well-defined, and controllable amounts of energy in electronic, translational, and vibrational degrees of freedom, but until recently, it has been much more difficult to exert control over the rotational energy of molecules (1-14). Traditional methods for optically preparing rotationally hot molecules are limited by strict selection rules that constrain angular momentum changes to small values (15, 16). Microwave spectroscopy has been used to a limited degree for walking molecules up a rotational ladder, but only small amounts of rotational energy (ΔJ ∼ 5) could be imparted to molecules with this approach (17, 18). Static electric fields have been explored for orienting molecules, but this approach is impractical for rotating molecules into high-energy states due to the high angular velocity and voltages required (19). Rotational motion in molecules can be induced with strong optical fields leading to rotational recurrences, but the amount of rotational energy obtained with this method is fairly modest (19)(20)(21)(22)(23)(24)(25). In some cases, photochemical reactions and inelastic collisions can be used to produce rotationally hot molecules, but the products generally have broad and poorly controlled rotational energy distributions (26).An important development in the area of light-matter interactions is the optical centrifuge for molecules (27,28). In this device, powerful ultrafast chirped laser pulses deposit rotational excitation in molecules that is comparable to, and in some cases even exceeds, interatomic binding energies. The optical centrifuge was proposed by Corkum and coworkers in 1999 and was first demonstrated in 2000 (27, 28). They used an optical centrifuge to spin Cl 2 molecules into J ∼ 420 and used a time-of-flight mass spectrometer to detect Cl radicals that resulted from rotationally induced dissociation. The dissociation energy of Cl 2 is 3.5 eV, but rotational...

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Negative Ion Spectroscopy

Cited by 111 publications

References 44 publications

Negative ions, mass selection, and photoelectrons

Negative ions, mass selection, and photoelectrons

Partial cross sections for Rb? photodetachment in the region of the Rb(5p 2 P 1/2,3/2) thresholds and their analysis by multichannel quantum defect theory

Dynamics of molecules in extreme rotational states

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