Emission analysis of expanding laser produced lithium plasma plume in presence of ambient gas

Image analysis of expanding laser-produced lithium plasma plume in variable transverse magnetic field

“…While the slow moving species dominated by neutrals represent the trailing portion of the plume. The above argument is strongly supported by our optical emission spectroscopic data (Joshi et al, 2009) where strong Li II emission line appeared at shorter time delays as compared to that of Li I emission. Further, it is evident that the typical electron temperature and electron density of Li plasma are around 2 eV and 10 17 cm −3 under similar experimental condition (Joshi et al, 2009).…”

“…The above argument is strongly supported by our optical emission spectroscopic data (Joshi et al, 2009) where strong Li II emission line appeared at shorter time delays as compared to that of Li I emission. Further, it is evident that the typical electron temperature and electron density of Li plasma are around 2 eV and 10 17 cm −3 under similar experimental condition (Joshi et al, 2009). In order to get the individual contribution of different atomic processes, we have calculated the PECs for the strongest lines from neutrals (670.8 and 610.3 nm) as well as ions (548.4 and 478.8 nm).…”

“…As discussed in our earlier works (Kumar et al, 2010a;Joshi et al, 2009), the intensity of a particular line can be expressed in terms of PEC. In ADAS, it is assumed that the collisional and radiative processes between all excited levels redistribute the populations, and the excited levels are in quasi-static equilibrium with the metastable.…”

“…The individual contribution of different atomic processes can be identified from the computed photoemissivity coefficients (PEC) for ionic and neutral lines (Kumar et al, 2010a;Joshi et al, 2009), using atomic data and analysis structure ADAS (ADAS database). As discussed in our earlier works (Kumar et al, 2010a;Joshi et al, 2009), the intensity of a particular line can be expressed in terms of PEC.…”

“…From the knowledge of PEC, the intensity of a particular line can be represented by (Joshi et al, 2009;Kumar et al, 2010a) …”