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6 Feb 2012

Volume 100, Issue 6, Articles (06xxxx)

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Appl. Phys. Lett. 100, 061101 (2012); http://dx.doi.org/10.1063/1.3665180 (3 pages)

I. E. Khodasevych, C. M. Shah, S. Sriram, M. Bhaskaran, W. Withayachumnankul, B. S. Y. Ung, H. Lin, W. S. T. Rowe, D. Abbott, and A. Mitchell
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Characterization of cluster/monomer ratio in pulsed supersonic gas jets

X. Gao, X. Wang, B. Shim, A. V. Arefiev, R. Korzekwa, and M. C. Downer

Appl. Phys. Lett. 100, 064101 (2012); http://dx.doi.org/10.1063/1.3683543 (4 pages) | Cited 2 times

Online Publication Date: 8 February 2012

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We determine cluster mass fraction fc(r,t) at position r within, and time t after firing, a pulsed supersonic gas jet by measuring femtosecond evolution of the jet’s refractive index by single-shot frequency domain holography. A fs pump pulse singly ionizes monomers, while quasi-statically ionizing and heating clusters to a level at which recombination remains negligible as clusters expand. Under these conditions, index evolves in two simple steps corresponding to monomer and cluster contributions, allowing recovery of fc without detailed cluster dynamic modeling. Variations of fc with t are measured.
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52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.75.-d Plasma devices
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.25.Jm Ionization of plasmas
36.40.Gk Plasma and collective effects in clusters
47.40.Ki Supersonic and hypersonic flows

Plasma resonances in a microwave-driven microdischarge

J. Xue, R. S. Urdahl, and J. E. Cooley

Appl. Phys. Lett. 100, 064102 (2012); http://dx.doi.org/10.1063/1.3681146 (3 pages) | Cited 2 times

Online Publication Date: 8 February 2012

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This work investigates resonances in a capacitively coupled, low pressure krypton microdischarge operated at 2.5 GHz. A circuit model for the device, which has a length dimension of approximately 1 mm, calculates impedance values for a range of electron densities. The model results predict several “parallel” and “series” resonances at the driving frequency when the electron density is approximately 8 × 1011 cm−3 and 5 × 1012 cm−3. The series resonance occurs when the resistance approaches the output impedance of the radio-frequency signal source, minimizing the reflected power. These resonances explain an experimentally observed jump in intensity with increasing input power.
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52.80.Pi High-frequency and RF discharges
52.50.Dg Plasma sources
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.75.-d Plasma devices
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