Laser Induced Desorption of Gas from Stainless Steel Surfaces.
Abstract
Laser induced desorption of gases from stainless steel target surfaces in vacuum of the order of 10 to the -7th power Torr was studied as a special case of photon-induced desorption. Adsorption phenomena and induced desorption were examined with emphasis on desorption caused by direct photon excitation and photon-induced thermal effects. The photon sources employed were infrared laser pulses with intensities of the order of 10 MW/sq cm produced by a Q-switched Nd-glass laser. Total pressure and mass spectrometric partial pressure measurements of hydrogen, carbon dioxide, and nitrogen/carbon monoxide were taken. The results indicated that laser induced desorption is principally a thermal mechanism. Desorption energies derived from measured partial pressure changes and calculated surface temperature increases were found to be 8.5 kcal/mole for hydrogen and 14.7 kcal/mole for carbon dioxide. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1977
- Accession Number
- ADA042323
Entities
People
- James Stanley Polk
Organizations
- Naval Postgraduate School