skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Prominent Soft X-ray Lines of Sr-like Au41+ in Low-energy EBIT Spectrum

Abstract

Relativistic multireference M{o}ller-Plesset perturbation theory has been employed to calculate with high accuracy the energy levels and transition probabilities of Cu- to Sr-like gold ions. The many-body calculations were carried out to identify the unassigned blended lines in the 35-40 angstroms region of the low-energy EBIT spectrum of the gold ions. Most of the prominent lines in the 35-40 angstroms region were identified as the emission lines in Sr-like gold.

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
908138
Report Number(s):
UCRL-CONF-229575
TRN: US0703646
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: 13th Internat. Conf. on the Physics of Highly Charged Ions, Belfast, United Kingdom, Aug 28 - Sep 01, 2006
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ACCURACY; ENERGY LEVELS; GOLD; GOLD IONS; PERTURBATION THEORY; PHYSICS

Citation Formats

Vilkas, M J, Ishikawa, Y, and Trabert, E. Prominent Soft X-ray Lines of Sr-like Au41+ in Low-energy EBIT Spectrum. United States: N. p., 2007. Web.
Vilkas, M J, Ishikawa, Y, & Trabert, E. Prominent Soft X-ray Lines of Sr-like Au41+ in Low-energy EBIT Spectrum. United States.
Vilkas, M J, Ishikawa, Y, and Trabert, E. Tue . "Prominent Soft X-ray Lines of Sr-like Au41+ in Low-energy EBIT Spectrum". United States. doi:. https://www.osti.gov/servlets/purl/908138.
@article{osti_908138,
title = {Prominent Soft X-ray Lines of Sr-like Au41+ in Low-energy EBIT Spectrum},
author = {Vilkas, M J and Ishikawa, Y and Trabert, E},
abstractNote = {Relativistic multireference M{o}ller-Plesset perturbation theory has been employed to calculate with high accuracy the energy levels and transition probabilities of Cu- to Sr-like gold ions. The many-body calculations were carried out to identify the unassigned blended lines in the 35-40 angstroms region of the low-energy EBIT spectrum of the gold ions. Most of the prominent lines in the 35-40 angstroms region were identified as the emission lines in Sr-like gold.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Mar 27 00:00:00 EDT 2007},
month = {Tue Mar 27 00:00:00 EDT 2007}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • A portable high resolution soft x-ray and extreme ultraviolet (EUV) spectrometer has been developed for spectroscopic research at the Shanghai Electron Beam Ion Trap (EBIT) laboratory. A unique way of aligning the grazing incidence spectrometer using the zero order of the grating is introduced. This method is realized by extending the range of the movement of the CCD detector to cover the zero order. The alignment can be done in a few minutes, thus leading to a portable spectrometer. The high vacuum needed to be compatible with the EBITs is reached by mounting most of the translation and rotation stagesmore » outside the chamber. Only one high vacuum compatible linear guide is mounted inside the chamber. This is to ensure the convenient interchange of the gratings needed to enable wavelength coverage of the whole range of 10 to 500 Å. Spectra recorded with one of our low energy EBITs shows that a resolving power of above 800 can be achieved. In the slitless configuration used in this work, we found the resolving power to be limited by the width of the EBIT plasma. When mounted on the Shanghai EBIT which is a high energy EBIT and has a narrower EBIT plasma width, the estimated resolving power will be around 1400 at 221.15 Å.« less
  • The intensity distributions in the continuous spectrum of soft x rays over the wavelength range from 80 tc 180 A were investigated for various elements and accelerating potentials by means of a grazing incidence vacuum spectrograph with a concave glass grating in a Rowland mounting. Intensity distributions were calculated with the help of previously verified reflecting power coefficients for the grating. The x-ray intensity per unit wavelength interval was found to be proportional to 1/ LAMBDA /sup alpha / where alpha is a number between 1.8 and 3.0. The observed values for alpha are seen to depend upon target material,more » accelerating voltage, and angle of observation. The experimental results are compared with the predictions of the basic Somerfeld theory where possible and found to be in good agreement. Details of the apparatus and an outline of the theoretical formulation are presented. (auth)« less
  • The intensity distributions in the low energy continuous x-ray spectrum from solid targets were studied by means of a calibrated vacuum spectrometer. The x-ray beam was incident upon a concave glass grating at a grazing angle of 4.642 deg , and the dispersed radiation was recorded on a photographic plate mounted along the Rowland circle. Knowledge of grating efficiency and instrumental dispersion made it possible to obtain a relative intensity distributron of the radiation emitted from the source. The target consisted of a freshly evaporated layer which was subsequently renewed at frequent intervals during expesure. Pressures below 3.0 x l0-6more » mm of mercury were maintained in the x-ray tube during exposure. The experimental observations were confined to the wavelength interval extending from 80 to 180 A. The investigation indicated that the intensity per unit wavelength interval can be closely approxr-mated by a function of the form B/ lambda /sup alpha /. In particular, the values of alpha ranged from 1.9 for aluminum at an accelerating potential of 3.0 kv to a value of 3.0 for silver and gold at accelerating potentials of 3.0 kv. B is a normalization constant chosen for convenience to give a relative intensity of 100 at a wavelength of 80 A. Reduction of the accelerating potential below 3.0 kv resulted in a decrease in the observed value of alpha for both silver and manganese targets; i.e., as the observable range of wavelengths approached the short wavelength limit, the intensity per unit wavelength interval tended toward a l/ lambda /sup 2/ dependence. Observation of the spectrum at various angles of photon emergence showed variations in the spectral shape which are in accordance with theory, but there appeared to be no significant evidence of the effects of self-absorption of the x-ray photons by target material. Relative intensity distributions in the continuous spectrum for a magnesium target at a potential of 675 volts and a manganese target at a potential of 630 volts sgreed with the predictions of the basic Sommerfeld theory for the continuous spectrum. Published rangeenergy relations indicated that electrons with kinetic energies around 600 ev penetrate to a depth of less than 200 A; thus significant contributions to the spectrum come from interactions of electrons and stoms which lie essentially in the surface layers of the target. Since the theory is based upon one interaction between a given electron and a monolayer of atoms, the agreement of the experimental results with prediction indicated that use of the thin target model is applicable at these electron energies and x-ray wavelengths.« less
  • The soft X-ray line emission from five low-mass X-ray binaries observed by the Einstein Observatory (HEAO 2) Objective Grating Spectrometer is examined. Observed spectra are fitted to model spectra consisting of emission from an optically thin plasma. Fits are performed using a variety of different assumptions for elemental abundances, heating and ionization mechanisms, and the distribution of gas temperature and ionization parameter. The results are discussed in the context of current models for the accretion flow in low-mass X-ray binaries. 17 refs.