Proceedings of National Laser Symposium (NLS-21), BARC, Mumbai 6-9 Feb 2013 Influence of Transverse Magnetic field on Barium Laser Produced Plasma using Time of Flight Spectroscopy M.Srinivasa Raju 1 , Pramod Gopinath 1 , R.K. Singh 2 , Ajai Kumar 2 1 Indian Institute of Space science and Technology, Thiruvananthapuram, Kerala 2 Institute for Plasma Research, Gandhinagar, Gujarat Email: physicssreenu@yahoo.co.in Abstract: Laser produced barium plasma expanding across a uniform magnetic field of 0.45 T has been studied by time of flight emission spectroscopy at very low pressure 5 x 10 -5 Torr. The temporal profiles of Ba I 553.5 nm lines are discussed at different distances from 2mm to 12mm from the target surface. The variation in the velocities of the above neutral species has been investigated. I. INTRODUCTION The laser-induced breakdown spectroscopy (LIBS) is extensively used in the elemental analysis of solids, liquids, gases, and aerosol samples 1 . In this technique, a high energy laser beam is focused on the target material which generates plasma that constitutes electrons, ions, neutral atoms, etc. The dynamics of laser-produced plasma in the external magnetic field is extremely complicated and many researchers have put lot of effort in understanding it. II. EXPERIMENTAL DETAILS A schematic of the experimental setup used for these experiments is shown in the Fig. 1. A plasma plume is generated inside a multi-port stainless steel chamber by irradiating a Nd:YAG laser with wavelength 1064 nm, pulse width 8ns onto a Barium target of diameter 22 mm. The laser beam was focused onto the target to a spot size of 1mm diameter using a lens. The laser is operated in the single shot mode with a pulse energy of 150 mJ. Alignment Laser Photo diode Energy Meter Alignment Laser Fig. 1. Schematic of Experimental Setup PC D S O Monochro mator P M T Nd :Y A G