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Please use this identifier to cite or link to this item: http://dyuthi.cusat.ac.in/purl/2385

Title: Dynamics of laser produced silver plasma under film deposition conditions studied using optical emission spectroscopy
Authors: Riju, C Issac
Vasudevan Pillai, K
Harilal, S S
Geetha K, Varier
Bindhu, C V
Pramod, Gopinath
Radhakrishnan, P
Nampoori, V P N
Vallabhan, C P G
Technology
Keywords: Laser produced plasma
Time of flight measurements
Emission spectroscopy
Issue Date: 1998
Publisher: Elsevier Science
Abstract: Laser produced plasma from silver is generated using a Q-switched Nd:YAG laser. Optical emission spectroscopy is used to carry out time of flight (TOF) analysis of atomic particles. An anomalous double peak profile in the TOF distribution is observed at low pressure. A collection of slower species emerge at reduced pressure below 4 X lO-3 mbar and this species has a greater velocity spread. At high pressure the plasma expansion follows the shockwave model with cylindrical symmetry whereas at reduced pressure it shows unsteady adiabatic expansion (UAE). During UAE the species show a parabolic increases in the expansion time with radial distance whereas during shock wave expansion the exponent is less than one. The angular distribution of the ablated species in the plume is obtained from the measurement of optical density of thin films deposited on to glass substrates kept perpendicular to the plume. There is a sharp variation in the film thickness away from the film centre due to asymmetries in the plume.
URI: http://dyuthi.cusat.ac.in/purl/2385
Appears in Collections:Dr.C P Girijavallabhan

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