In:
Applied Spectroscopy, SAGE Publications, Vol. 53, No. 3 ( 1999-03), p. 278-282
Abstract:
A spatially and temporally resolved transient absorption technique has been employed to investigate the dynamics of ground-state YO during 355 nm laser ablation of Y 2 O 3 . Time-of-flight (TOF) measurements of the expanding YO plume in vacuum and in Ar or O 2 ambient are reported. During the initial expansion of YO in vacuum, the center-of-mass velocity and the expansion velocity increase with distance up to the boundary of the Knudsen layer. In the presence of oxygen, reactions of the ablated atomic species with oxygen take place, resulting in the formation of YO with broad velocity distribution. From the peak time of the observed TOF distributions, the most probable velocities of YO are found to be 2.6 km/s in vacuum, 2.2 km/s in 50 mTorr Ar, and 1.8 km/s in 50 mTorr O 2 , respectively. The dependence of the peak time on distance shows that the experimental data can be well fitted with a shock wave model at higher ambient gas pressure.
Type of Medium:
Online Resource
ISSN:
0003-7028
,
1943-3530
DOI:
10.1366/0003702991946659
Language:
English
Publisher:
SAGE Publications
Publication Date:
1999
detail.hit.zdb_id:
1474251-2
SSG:
11
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