14 October 1997 Experimental study of continuum lowering
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Abstract
We present time- and space-resolved XUV spectra of boron and carbon plasmas created by focusing 100-fs laser pulses on a solid target to an intensity of 1017 W/cm2. Emission lines originating from He-like and H-like excited states from n equals 2 to the ionization limit are observed with a spatial resolution of 100 micrometers in the direction normal to the target plane and with a temporal resolution of up to 4 ps. The position of the ionization limited is seen to depend very crucially on the plasma parameters of density and temperature, and is explained through continuum lowering effects. We observed the dynamics of the continuum lowering for plasma slices at different distances from the target, and record a maximum lowering of 40 eV in He-like carbon (10% of the ionization potential) from the disappearance of the 1snp - 1s2 line and from the position of the continuum edge.
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Marc Nantel, Gengyu Ma, S. Gu, Christian Y. Cote, Jirou Itatani, Takashi Buma, Anatoly M. Maksimchuk, Donald P. Umstadter, "Experimental study of continuum lowering", Proc. SPIE 3157, Applications of X Rays Generated from Lasers and Other Bright Sources, (14 October 1997); doi: 10.1117/12.283988; https://doi.org/10.1117/12.283988
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KEYWORDS
Plasmas

Picosecond phenomena

Ionization

Electrons

Ions

Carbon

Solids

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