Parametric study of expanding plasma plume formed by laser-blow-off of thin film using triple Langmuir probe

Journal Article · Sat Aug 15 00:00:00 EDT 2009 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3204946· OSTI ID:21361777

Kumar, Ajai; Singh, R K; Thomas, Jinto; Sunil, S ^[1]

---

1. Institute for Plasma Research, Bhat, Gandhinagar 382 428 (India)

The triple probe technique has been used to study the parameters of flowing plasma plume formed by laser-blow-off (LBO) of a multicomponent LiF-C target. The advantages of triple Langmuir probe over the single probe have been discussed with regard to the present study. Our results show that triple probe is better suited for parametric measurements close to the target. The spatiotemporal evolutions of electron density and temperature were measured in different ambient environments and for various laser fluences. The angular distribution of electron density and temperature was also measured. It was found that the presence of ambient gas drastically affects the electron density and temperature of the LBO plume. Large enhancement in n{sub e} and T{sub e} at intermediate pressures (10{sup -2} Torr) is expected due to increase in collisional processes. On the other hand, laser fluence does not affect the observed n{sub e} and T{sub e} significantly. In vacuum, a new phenomenon, i.e., an oscillation in the trailing portion of the plasma plume at a closer distance from the target, is also reported.

• OSTI ID: 21361777
• Journal Information: Journal of Applied Physics, Vol. 106, Issue 4; Other Information: DOI: 10.1063/1.3204946; (c) 2009 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
ANGULAR DISTRIBUTION
ELECTRON DENSITY
EVOLUTION
LANGMUIR PROBE
LASERS
LITHIUM FLUORIDES
OSCILLATIONS
PARAMETRIC ANALYSIS
PLASMA
PLASMA PRODUCTION
PLUMES
THIN FILMS
ALKALI METAL COMPOUNDS
DISTRIBUTION
ELECTRIC PROBES
FILMS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
LITHIUM COMPOUNDS
LITHIUM HALIDES
PROBES