Award Date

1-1-1996

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Physics

Number of Pages

99

Abstract

A new method is developed that combines the production of ions by laser ablation with a reflection time-of-flight mass spectrometer (RTOFMS) for charge-transfer cross section measurements. This method allows a specific charge-transfer channel of an ion-neutral pair to be measured at energies of about 0.1 KeV/amu. The charge-transfer cross section is determined by measuring the intensity ratio of the product ions to the parent ions after the charge-transfer reactions occur in the reflection drift tube of the RTOFMS. First, a calibration measurement of C{dollar}\sp{2+}{dollar} with H{dollar}\sb2{dollar} is carried out and the result agrees with previous measurements by other research groups. Then, a first-time measurement of Si{dollar}\sp{3+}{dollar} with He at silicon ion energy of 0.16 KeV/amu is carried out. The single electron charge-transfer cross section of this reaction is {dollar}\rm 1.27({\pm}0.19)\times 10\sp{-15} cm\sp2.{dollar}.

Keywords

Ablation; Charge; Charge Transfer; Cross; Flight; Ion; Laser; Mass; Measurement; Measurements; Reflection; Section; Source; Sources; Spectrometer; Time; Transfer; Charge Transfer

Controlled Subject

Nuclear physics; Molecular dynamics; Plasma astrophysics

File Format

pdf

File Size

2375.68 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

Permissions

If you are the rightful copyright holder of this dissertation or thesis and wish to have the full text removed from Digital Scholarship@UNLV, please submit a request to digitalscholarship@unlv.edu and include clear identification of the work, preferably with URL.

Rights

IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/

Download


Share

COinS