8-12 July 2013
Africa/Johannesburg timezone
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Plasma dynamics and species emission study of vanadium (IV) oxide (VO2) in oxygen background

Presented by Ms. Bathusile MASINA on 9 Jul 2013 from 17:40 to 18:40
Type: Poster Presentation
Session: Poster1
Track: Track C - Photonics

Abstract

Optical emission spectroscopy diagnostic of VO2 plasma created by an excimer KrF laser pulse at 2 J/cm2 laser fluences was performed under range of oxygen pressure. A spatio-temporal evolution study of different species such as VI (437.85 nm), VII (326.1 nm), VIII (237.1 nm) and VO (608.56 nm) are presented and compared. The plume expansion dynamics of an ablated target of VO2 was also investigated using fast imaging. Free expansion, splitting and stopping of the plume were observed at different pressure and time delays. It was observed that at early time delays, the expansion is linear. However, as time evolves, the plume is decelerated and comes to rest. The plasma plume dynamics was analysed in the framework of Predtechensky and Mayorov model and drag model. It was discovered that Predtechensky and Mayorov model gives a general description of the plume expansion. However, at a later time delays, it is rather the drag model which is valid.

Award

Yes

Level

PhD

Supervisor

Prof. Andrew Forbes, AForbes1@csir.co.za CSIR National Laser Centre and Univesirty of KwaZulu-Natal

Paper

No

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