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Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic

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X rays from optical-field ionized plasmas at low density.

G Pretzler¹, E E Fill

¹Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.

|May 15, 1997

Summary

Researchers generated soft x-rays using optical-field ionization in a controlled gas cell. Most emissions were stronger with circular polarization, but some Li-like lines anomalously favored linear polarization.

Area of Science:

Plasma physics
Atomic physics
X-ray generation

Background:

Optical-field ionization (OFI) is a method for generating high-intensity radiation.
Controlling plasma conditions is crucial for understanding x-ray emission characteristics.
Previous studies often involved high-density plasmas, complicating analysis.

Purpose of the Study:

To investigate soft x-ray emission from OFI in a low-pressure gas cell.
To compare x-ray intensity for circularly and linearly polarized driving light.
To identify and discuss mechanisms behind observed polarization-dependent emission.

Main Methods:

Generating x-rays via OFI in a low-pressure nitrogen (N2) gas cell.
Utilizing controlled experimental conditions to minimize high-density plasma effects.

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Analyzing soft x-ray spectra and intensity variations based on light polarization.

Main Results:

Soft x-ray emission characteristics largely align with theoretical predictions.
Higher x-ray intensity was generally observed for circularly polarized light.
Several lithium-like (Li-like) lines exhibited unexpectedly strong emission with linearly polarized light.

Conclusions:

Controlled OFI in low-pressure gases provides a reliable platform for studying x-ray generation.
Polarization of the driving laser significantly impacts soft x-ray emission.
Anomalous emission in Li-like lines suggests specific atomic or plasma processes influenced by linear polarization.