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| Abstract: | Doppler limited high resolution spectrum in the wavelength region 17224 to 17236 cm−1 of the first positive system (B 3Π g −A 3Σ u + ) of the N2 molecule is recorded by optogalvanic spectroscopic technique using a single mode ring dye laser. It is observed that the intensity and line width of the rotational line increase with the discharge current. Dependence of the collision broadening coefficient on the current was also evaluated. |
| URI: | http://dyuthi.cusat.ac.in/purl/2637 |
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| Dyuthi-P0196.pdf | (533.5Kb) |
| Abstract: | The changes in emission characteristics of a neon hollow cathode discharge by resonant laser excitation of 1s 5→2p 2 and 1s 5→2p 4 transition have been studied by simultaneously monitoring the optogalvanic effect and the laser induced fluorescence. It has been observed that resonant excitation causes substantial variation in the relative intensities of lines in the emission spectrum of neon discharge. |
| URI: | http://dyuthi.cusat.ac.in/purl/2633 |
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| Dyuthi-P0192.pdf | (328.6Kb) |
| Abstract: | Laser-induced photoelectric and photoemission optogalvanic effects in a Ne-Nd hollow cathode discharge have been studied using a continuous wave laser source. The potential barrier for photoinduced electron emission from the cathode decreases as the applied voltage is increased. Owing to secondary electron emission in the plasma, the photocurrent is greater than that without discharge. The multiplication of secondary electrons and the quantum efficiency are also investigated. |
| URI: | http://dyuthi.cusat.ac.in/purl/2579 |
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| Dyuthi-P0139.pdf | (320.5Kb) |
| Abstract: | We report the experimental observation of subcritical Hopf bifurcation and the existence of non-oscillating “windows” in the dynamics of a Ne-Nd hollow cathode discharge current as the control parameter. |
| URI: | http://dyuthi.cusat.ac.in/purl/2581 |
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| Dyuthi-P0141.pdf | (265.0Kb) |
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