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Angular dependent interaction of met...

Petluri, Raghuram.

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Angular dependent interaction of metastable helium molecules on the surfaces of helium nanodroplets.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Angular dependent interaction of metastable helium molecules on the surfaces of helium nanodroplets./
Author:	Petluri, Raghuram.
Description:	108 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4287.
Contained By:	Dissertation Abstracts International66-08B.
Subject:	Physics, Condensed Matter. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3186917
ISBN:	9780542284076

Angular dependent interaction of metastable helium molecules on the surfaces of helium nanodroplets.
Petluri, Raghuram.

Angular dependent interaction of metastable helium molecules on the surfaces of helium nanodroplets. - 108 p.

Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4287.

Thesis (Ph.D.)--University of Rhode Island, 2005.

A metastable helium molecule is produced in a helium nanodroplet by electron bombardment. The molecule, identified as the long lived triplet state ( a3S+u ), is found to reside on the surface of the droplet. Upon absorbing an infrared photon, it becomes detached from the surface of the droplet. The molecule is subsequently detected when it releases a secondary electron by striking a metal surface in the detector region. The photo-induced detachment process, which we call "Molecular Detachment Spectroscopy", is used to study the ro-vibrational structure of c3S+g←a3 S+u electronic transition in 910--985 nm region.

ISBN: 9780542284076Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Angular dependent interaction of metastable helium molecules on the surfaces of helium nanodroplets.
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100 1 $a Petluri, Raghuram. $3 1913299
245 1 0 $a Angular dependent interaction of metastable helium molecules on the surfaces of helium nanodroplets.
300 $a 108 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4287.
500 $a Adviser: Jan A. Northby.
502 $a Thesis (Ph.D.)--University of Rhode Island, 2005.
520 $a A metastable helium molecule is produced in a helium nanodroplet by electron bombardment. The molecule, identified as the long lived triplet state ( a3S+u ), is found to reside on the surface of the droplet. Upon absorbing an infrared photon, it becomes detached from the surface of the droplet. The molecule is subsequently detected when it releases a secondary electron by striking a metal surface in the detector region. The photo-induced detachment process, which we call "Molecular Detachment Spectroscopy", is used to study the ro-vibrational structure of c3S+g←a3 S+u electronic transition in 910--985 nm region.
520 $a The high resolution spectrum exhibits a highly non-thermal rotational state distribution. The rotational lines are found to be blue shifted from their gas values by &sim;2.6 cm-1, indicating that the molecule is weakly bound to the droplet. In addition, all the lines are sharp, well resolved, and highly structured as a result of the molecule's interaction with droplet surface.
520 $a We develop a model that explains semi-quantitatively the experimentally observed spectral shifts and line shapes. The interaction potential between the metastable molecule and the droplet strongly depends on the orientation of the molecule for the final state ( c3S+g ). For the nearly isotropic initial state ( a3S+u ), however, orientation has no effect. Spectral shifts are obtained from these angular dependent surface potentials. Intensities of the spectral lines are explained using Franck-Condon principle.
590 $a School code: 0186.
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Molecular. $3 1018648
650 4 $a Chemistry, Physical. $3 560527
690 $a 0611
690 $a 0609
690 $a 0494
710 2 0 $a University of Rhode Island. $3 1022014
773 0 $t Dissertation Abstracts International $g 66-08B.
790 1 0 $a Northby, Jan A., $e advisor
790 $a 0186
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3186917