東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Energy-resolved positron-molecule an...

Barnes, Levi Daniel.

Linked to FindBook

Google Book

Amazon

博客來

Energy-resolved positron-molecule annihilation: Vibrational Feshbach resonances and bound states.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Energy-resolved positron-molecule annihilation: Vibrational Feshbach resonances and bound states./
Author:	Barnes, Levi Daniel.
Description:	121 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1527.
Contained By:	Dissertation Abstracts International66-03B.
Subject:	Physics, Molecular. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3167816
ISBN:	0542039826

Energy-resolved positron-molecule annihilation: Vibrational Feshbach resonances and bound states.
Barnes, Levi Daniel.

Energy-resolved positron-molecule annihilation: Vibrational Feshbach resonances and bound states. - 121 p.

Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1527.

Thesis (Ph.D.)--University of California, San Diego, 2005.

This thesis describes a new technique for the measurement of positron annihilation rates for positrons incident on atoms and molecules. Positrons from a radioactive source are collected and cooled in a Penning-Malmberg trap and formed into a magnetically guided beam. The beam is then guided through a cell filled with the molecule to be studied while the gamma ray signal from annihilation events is recorded. As distinguished from previous work, these experiments allow tuning of the positron energy over the range between 50 meV and the threshold for positronium formation. The energy resolution of the beam is 25 meV. A key result in these measurements is the discovery of resonances in the annihilation rates for selected molecules, associated with the vibrations of the target. We attribute these resonances (in accordance with a model proposed by Gribakin [28]) to the presence of a Feshbach resonant state consisting of a positron bound to a vibrationally excited target molecule. The annihilation spectra for a number of molecules are presented including alkane molecules, fluoroalkanes, deuterated alkanes, ring hydrocarbons, noble gases, alkenes and alkynes. The goals of these measurements are to investigate the dependence of these resonant processes on the size, composition and shape of the target molecules, and to provide benchmarks for theoretical descriptions of this process.

ISBN: 0542039826Subjects--Topical Terms:

1018648
Physics, Molecular.

Energy-resolved positron-molecule annihilation: Vibrational Feshbach resonances and bound states.
LDR:02316nmm 2200277 4500 001 1813938
005 20060503082224.5
008 130610s2005 eng d
020 $a 0542039826
035 $a (UnM)AAI3167816
035 $a AAI3167816
040 $a UnM $c UnM
100 1 $a Barnes, Levi Daniel. $3 1903424
245 1 0 $a Energy-resolved positron-molecule annihilation: Vibrational Feshbach resonances and bound states.
300 $a 121 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1527.
500 $a Chair: Clifford M. Surko.
502 $a Thesis (Ph.D.)--University of California, San Diego, 2005.
520 $a This thesis describes a new technique for the measurement of positron annihilation rates for positrons incident on atoms and molecules. Positrons from a radioactive source are collected and cooled in a Penning-Malmberg trap and formed into a magnetically guided beam. The beam is then guided through a cell filled with the molecule to be studied while the gamma ray signal from annihilation events is recorded. As distinguished from previous work, these experiments allow tuning of the positron energy over the range between 50 meV and the threshold for positronium formation. The energy resolution of the beam is 25 meV. A key result in these measurements is the discovery of resonances in the annihilation rates for selected molecules, associated with the vibrations of the target. We attribute these resonances (in accordance with a model proposed by Gribakin [28]) to the presence of a Feshbach resonant state consisting of a positron bound to a vibrationally excited target molecule. The annihilation spectra for a number of molecules are presented including alkane molecules, fluoroalkanes, deuterated alkanes, ring hydrocarbons, noble gases, alkenes and alkynes. The goals of these measurements are to investigate the dependence of these resonant processes on the size, composition and shape of the target molecules, and to provide benchmarks for theoretical descriptions of this process.
590 $a School code: 0033.
650 4 $a Physics, Molecular. $3 1018648
650 4 $a Physics, Atomic. $3 1029235
690 $a 0609
690 $a 0748
710 2 0 $a University of California, San Diego. $3 1018093
773 0 $t Dissertation Abstracts International $g 66-03B.
790 1 0 $a Surko, Clifford M., $e advisor
790 $a 0033
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3167816