TY - JOUR
T1 - Comparison of single and double-pulse excitation during the earliest stage of laser induced plasma
AU - Nagli, L.
AU - Gaft, M.
AU - Gornushkin, I.
N1 - Funding Information:
Acknowledgements Financial support from the DFG-NSF grant GO 1848/1-1 and NI 185/38-1 (USA, Germany) is gratefully acknowledged.
PY - 2011/7
Y1 - 2011/7
N2 - This paper deals with comparison of single-pulse (SP) and double-pulse (DP) excited plasmas during their earliest phase of life, from 0 to 500 ns. The samples are Si and Al and the irradiance per pulse is approximately 20 GW cm-2 under ambient conditions. It was found that at the beginning of a plasma lifespan, Si III and Al III ions were excited even under the SP excitation conditions and became much more abundant under DP excitation. The lifetime of doubly-ionized species was found to be very short, and after a delay of 200-300 ns they were not detected. The DP plasma differs from the SP plasma by the intensity of continuum radiation and by the width of emission lines, which are substantially narrower in the DP plasma. The intensity of light emitted from singly and, especially, doubly-ionized species is higher compared with neutral atoms; whereas the decay time of both neutral and ionized species is longer. An excitation mechanism for the DP plasma is proposed enabling qualitative and a quantitative explanation of the experimental data.
AB - This paper deals with comparison of single-pulse (SP) and double-pulse (DP) excited plasmas during their earliest phase of life, from 0 to 500 ns. The samples are Si and Al and the irradiance per pulse is approximately 20 GW cm-2 under ambient conditions. It was found that at the beginning of a plasma lifespan, Si III and Al III ions were excited even under the SP excitation conditions and became much more abundant under DP excitation. The lifetime of doubly-ionized species was found to be very short, and after a delay of 200-300 ns they were not detected. The DP plasma differs from the SP plasma by the intensity of continuum radiation and by the width of emission lines, which are substantially narrower in the DP plasma. The intensity of light emitted from singly and, especially, doubly-ionized species is higher compared with neutral atoms; whereas the decay time of both neutral and ionized species is longer. An excitation mechanism for the DP plasma is proposed enabling qualitative and a quantitative explanation of the experimental data.
KW - Collision dominated plasma model
KW - Double ionization
KW - Laser induced plasma
KW - Single ionization
UR - http://www.scopus.com/inward/record.url?scp=79960627207&partnerID=8YFLogxK
U2 - 10.1007/s00216-011-4806-9
DO - 10.1007/s00216-011-4806-9
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AN - SCOPUS:79960627207
SN - 1618-2642
VL - 400
SP - 3207
EP - 3216
JO - Analytical and Bioanalytical Chemistry
JF - Analytical and Bioanalytical Chemistry
IS - 10
ER -