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22 Jan 2007

Volume 90, Issue 4, Articles (04xxxx)

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Appl. Phys. Lett. 90, 043507 (2007); http://dx.doi.org/10.1063/1.2435508 (3 pages)

D. Y. Kim and A. J. Steckl
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Efficient coupling of high intensity short laser pulses into snow clusters

T. Palchan, S. Pecker, Z. Henis, S. Eisenmann, and A. Zigler

Appl. Phys. Lett. 90, 041501 (2007); http://dx.doi.org/10.1063/1.2435348 (3 pages) | Cited 10 times

Online Publication Date: 24 January 2007

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Measurements of energy absorption of high intensity laser pulses in snow clusters are reported. Targets consisting of sapphire coated with snow nanoparticles were found to absorb more than 95% of the incident light compared to 50% absorption in flat sapphire targets.
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42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation
42.65.Re Ultrafast processes; optical pulse generation and pulse compression

Electron trapping in radio-frequency atmospheric-pressure glow discharges

D. W. Liu, J. J. Shi, and M. G. Kong

Appl. Phys. Lett. 90, 041502 (2007); http://dx.doi.org/10.1063/1.2425045 (3 pages) | Cited 20 times

Online Publication Date: 25 January 2007

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In this letter, the authors present experimental evidence of electron trapping in radio-frequency (rf) atmospheric-pressure glow discharges. By linking electron density to nanosecond plasma images and optical emission spectroscopy, they show that electron trapping occurs under most discharge conditions. The level of electron trapping increases with increasing discharge current or/and increasing excitation frequency, and manifests itself in the change of the differential conductivity at the point of the gas breakdown. Finally, they demonstrate that electron trapping is largely related to whether the half rf period is shorter than the electron transition time across the electrode gap.
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52.80.Hc Glow; corona
52.80.Pi High-frequency and RF discharges
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.70.Ds Electric and magnetic measurements
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.25.Fi Transport properties
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