کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1240618 | 969132 | 2010 | 13 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Resonantly laser induced plasmas in gases: The role of energy pooling and exothermic collisions in plasma breakdown and heating Resonantly laser induced plasmas in gases: The role of energy pooling and exothermic collisions in plasma breakdown and heating](/preview/png/1240618.png)
The present work is a systematic experimental study of the plasma formation in cesium vapor induced by a continuous laser tuned to the resonance transition 6S1/2–6P3/2. Taking into account the measured absolute population densities of Cs ground and excited state atoms as well as the electron densities derived from Stark broadening of the Cs lines, complete local thermodynamic equilibrium in the laser-produced plasma was found for laser power densities ≈ 10 Wcm− 2 at cesium ground state number densities of about 1017 cm− 3. Direct conversion of the excitation energy or parts of the excitation energy in exothermic collisions of laser-excited atoms is concluded to be the major process for atomic vapor heating and subsequent formation of LTE plasmas.
Journal: Spectrochimica Acta Part B: Atomic Spectroscopy - Volume 65, Issue 1, January 2010, Pages 33–45