Extreme-ultraviolet beam-foil spectroscopy of highly ionized neon and argon. Doctoral thesis
A study of the extreme-ultraviolet radiation emitted by ion beams of highly ionized neon and argon after passage through thin foils was conducted. A grazing-incidence spectrometer was equipped with a position-sensitive microchannel plate (MCP) detector, which improved the detection efficiency by two orders of magnitude. The position information of the MCP was determined to be linear over 90% of the 50-mm-wide detector. Spectra spanning regions of over 100 A were accumulated at a resolution of less than 1 A. A wavelength calibration based on a second order equation of spectrometer position was found to result in an accuracy of - 0.1 A. Over 40 transitions of Ne VIII, Ne IX, and Ne X were observed in the wavelength region from 350 to 30 A from n=2-3,4,5; n=3-4,5,6,7,8; n=4-6,7; and n=5-9. An intensity calibration of the detection system allowed the determination of the relative populations of n=3 states of Ne VIII and Ne IX. An overpopulation of states with low orbital angular momenta support electron-capture predictions by the first-order Born approximation. The argon beam-foil data confirmed the wavelength predictions of 30 previously unobserved transitions in the wavlength region from 355 to 25 A from n=2-2; n=3-4; n=4-5,6,7; and n=6-8. Lifetime determinations were made by the simultaneous measurement of 26 argon lines in the spectral region from 295-180 A. Many of the n=2-2 transitions agreed well with theory.
- Research Organization:
- Air Force Inst. of Tech., Wright-Patterson AFB, OH (USA)
- OSTI ID:
- 6955139
- Report Number(s):
- AD-A-172840/1/XAB; AFIT/CI/NR-86-171D
- Country of Publication:
- United States
- Language:
- English
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Extreme-ultraviolet beam-foil spectroscopy of highly ionized neon and argon. Final report
XMM-NEWTON AND FUSE TENTATIVE EVIDENCE FOR A WHIM FILAMENT ALONG THE LINE OF SIGHT TO PKS 0558-504
Related Subjects
GENERAL PHYSICS
ARGON IONS
ENERGY-LEVEL TRANSITIONS
FAR ULTRAVIOLET RADIATION
ION BEAMS
COLLISIONS
ION COLLISIONS
PHOTON EMISSION
NEON IONS
THIN FILMS
BORN APPROXIMATION
ELECTRON CAPTURE
GRAZING
ION SPECTROSCOPY
BEAMS
CAPTURE
CHARGED PARTICLES
ELECTROMAGNETIC RADIATION
EMISSION
FILMS
IONS
RADIATIONS
SPECTROSCOPY
ULTRAVIOLET RADIATION
640301* - Atomic
Molecular & Chemical Physics- Beams & their Reactions