Design and implementation of a high-resolution, high-efficiency optical spectrometer

We present the design, implementation and testing of a high-efficiency, high-resolution transmission grating spectrometer for measurements of near-ultraviolet to visible-range spectra of light from an electron beam ion trap, where geometry is constrained. The system consists of two 5 in. diameter f/4.6 achromatic lenses, a 6 in. diameter transmission grating ion-beam etched in fused silica, and a thinned, backilluminated CCD detector. The simple design minimizes the number of optical components, each with optimal throughput and high efficiency. Using a 30 μm wide entrance slit, a resolving power (λ/Δλ) of 15 400 at λ≈3850 A has been demonstrated. The features and limitations of the instrument have been explored and an in situ calibration technique for use on the Livermore EBIT-II and SuperEBIT electron beam ion traps has been developed.

[1]  G. Brown,et al.  Measurement of an unusual M 1 transition in the ground state of Ti-like W 5 2 + , 2000 .

[2]  Marilyn B. Schneider,et al.  The Electron Beam Ion Trap: A New Instrument for Atomic Physics Measurements , 1988 .

[3]  K. Widmann,et al.  Wide-band, high-resolution soft x-ray spectrometer for the Electron Beam Ion Trap , 1999 .

[4]  K. Widmann,et al.  Measurements of nuclear parameters of high-Z isotopes performed on a high-energy electron beam ion trap , 1997 .

[5]  E. S. Meyer,et al.  Fabry-Perot spectroscopy of a visible magnetic dipole transition in Ba34+ , 1995 .

[6]  T. Fukami,et al.  Magnetic dipole transitions in titaniumlike ions , 2001 .

[7]  R. C. Weast.  CRC Handbook of Chemistry and Physics , 1973 .

[8]  P. Beiersdorfer,et al.  Implementation of a normal incidence spectrometer on an electron beam ion trap , 1999 .

[9]  P. Oxley,et al.  Studies of magnetic dipole transitions in highly charged argon and barium using an electron beam ion trap , 1997 .

[10]  P. Beiersdorfer,et al.  Visible-range spectroscopy and a lifetime measurement on Kr22+ in an electron beam ion trap , 2000 .

[11]  Savin,et al.  Direct Observation of the Spontaneous Emission of the Hyperfine Transition F=4 to F=3 in Ground State Hydrogenlike 165Ho66+ in an Electron Beam Ion Trap. , 1996, Physical review letters.

[12]  Peter Beiersdorfer,et al.  Very high resolution soft x-ray spectrometer for an electron beam ion trap , 1997 .

[13]  B. Shore,et al.  High-efficiency fused-silica transmission gratings. , 1997, Optics letters.

[14]  J. V. Porto,et al.  UV light from the ground term of Ti-like ytterbium, tungsten, and bismuth , 2000 .

[15]  M. Levine,et al.  High‐resolution x‐ray spectrometer for an electron beam ion trap , 1990 .

[16]  Morgan,et al.  Observation of visible and uv magnetic dipole transitions in highly charged xenon and barium. , 1995, Physical Review Letters.

[17]  P. Beiersdorfer,et al.  Forbidden Transitions in the Visible Spectra of an Electron Beam Ion Trap (EBIT) , 1998 .

[18]  Jerald A. Britten,et al.  In situ end-point detection during development of submicrometer grating structures in photoresist , 1995 .

[19]  B. Edĺen.  Forbidden Lines in Hot Plasmas , 1984 .

[20]  K. Widmann,et al.  Position and size of the electron beam in the high-energy electron beam ion trap , 1999 .

[21]  Jack Sugar,et al.  Forbidden Lines in ns2npk Ground Configurations and nsnp Excited Configurations of Beryllium through Molybdenum Atoms and Ions , 1986 .

[22]  Morgan,et al.  Anomalous Z dependence of a magnetic dipole transition in the Ti , 1996, Physical review. A, Atomic, molecular, and optical physics.

[23]  K. Widmann,et al.  A high-resolution transmission-type x-ray spectrometer designed for observation of the Kα transitions of highly charged high-Z ions , 1997 .

[24]  K. Widmann,et al.  Nuclear magnetization distribution radii determined by hyperfine transitions in the 1s level of H-like ions {sup 185}Re{sup 74+} and {sup 187}Re{sup 74+} , 1998 .

[25]  K. Wong,et al.  Spectroscopy in the extreme ultraviolet on an electron beam ion trap , 1999 .

[26]  E. S. Meyer,et al.  Kr Spectra from an Electron-Beam Ion Trap: 300 nm to 460 nm , 1997 .

[27]  K. Wong,et al.  Hyperfine structure of hydrogenlike thallium isotopes , 2001 .