I N i earlier publication it was pointed out that x-ray spectroscopy was, potentially, a practical tool for the routine analysis of the elements in biologic systems (1), and was particularly applicable to the problems of the clinical laboratory (2). This is the first of a series of studies designed to evaluate this method of analysis for the routine laboratory of clinical chemistry. Specificall...

We are in the process of designing and building a modular spectrometer with the goal of being portable for use at a diverse group of endstations at the ALS, LCLS and TLS. The basic design is based upon experience from several years of use with similar designs at the ALS. For detector positions of less than 1.3 m, the design incorporates a composite cantilevered swing arm. Two optical elements a...

In this article we describe a new slit grating spectrograph which is based on an e-beam written 10 000 linepairs/mm freestanding transmission diffraction grating. In combination with a thinned, back-illuminated charge coupled device ~CCD!, the spectrograph allows for real-time spectroscopy of laser-produced plasma x-ray sources within the wavelength region l51–20 nm. Calibration of grating and ...

We have carried out a thorough optical study of the closest star formation jet. The inner arcminute surrounding the class 0/I binary protostar L1551 IRS5 and its associated jet (HH154) have been observed using the Hubble Space Telescope with the WFPC2 camera, the ESO New Technology Telescope with the EMMI spectrograph and the Nordic Optical Telescope with the ALFOSC spectrograph. This data set ...

We have carried out a thorough optical study of the closest star formation jet. The inner arcminute surrounding the class 0/I binary protostar L1551 IRS5 and its associated jet (HH154) have been observed using the Hubble Space Telescope with the WFPC2 camera, the ESO New Technology Telescope with the EMMI spectrograph and the Nordic Optical Telescope with the ALFOSC spectrograph. This data set ...

New fully relativistic calculations of radiative rates and electron impact excitation cross sections for Fexvi are used to determine theoretical emission-line ratios applicable to the 251–361 Å and 32–77 Å portions of the extreme-ultraviolet (EUV) and soft X-ray spectral regions, respectively. A comparison of the EUV results with observations from the Solar Extreme-Ultraviolet Research Telescop...