LXXIV. A positive ray spectrograph

A slit grating spectrograph for quantitative soft x-ray spectroscopy

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 ...

Lxxiv. Studies on Pectin

Modular X-ray emission spectrograph Design for the ALS

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...

The Spectrograph

JILA Fellow John Hall will deliver the 2006 Richard C. Lord Lecture on May 2, on “Optical clocks, combs and coherence: defining and measuring optical frequency.” Born in 1934 in Denver, Hall is an alumnus of the Carnegie Institute of Technology, where he received B.S., M.S. and Ph.D. degrees. He conducted postdoctoral studies at the Department of Commerce’s National Bureau of Standards, now cal...

Spectrograph Imager on Keck

Using the Echellete Spectrograph Imager (ESI) on the Keck II 10-m telescope we have measured the redshifts of the host galaxies of gamma-ray bursts GRB990506 and GRB000418, z = 1.30658 ± 0.00004 and 1.1181 ± 0.0001, respectively. Thanks to the excellent spectral resolution of ESI (λ/∆λ = 13000) we resolved the [O II] 3727 doublet in both cases. The measured redshift of GRB990506 is the highest ...