Ultraviolet Radiation Physics Research Articles

The 15th international conference on vacuum ultraviolet radiation physics

The fifteenth conference in the Vacuum Ultraviolet Radiation Physics series (VUV XV) took place in Berlin, Germany, from July 29th to August 3rd, 2007. This conference series began in 1962 in Los Angeles with the aim of encompassing theoretical as well as experimental studies of the interaction of ultraviolet and soft X-ray radiation with matter. In this year's VUV conference, more than 520 participants from 32 countries gathered in the Konzerthaus am Gendarmenmarkt, a famous concert hall right in the historic center of Berlin, to report on their scientific results and to meet old friends. The conference program consisted of 89 plenary, invited and contributed talks. Since young scientists are the target audience of the VUV-series, more than 450 contributions were presented as posters.

14th International Conference on Ultraviolet Radiation Physics

14th International Conference on Ultraviolet Radiation Physics

13th international conference on vacuum ultraviolet radiation physics

13th international conference on vacuum ultraviolet radiation physics

Proceedings of the 11th International Conference on Vacuum Ultraviolet Radiation Physics, Tokyo, Japan, 27 August–1 September 1995

Proceedings of the 11th International Conference on Vacuum Ultraviolet Radiation Physics, Tokyo, Japan, 27 August–1 September 1995

Historical Survey and New Opportunities in the VUV

The recent development of synchrotron radiation science is reviewed in relation to results reported at conferences on vacuum ultraviolet radiation physics, and prospects for research in the near future are presented. Emphasis is placed on spectroscopy in the vacuum ultraviolet and soft X-ray regions. Other topics such as applications to engineering, biophysics, materials science and surface science are briefly discussed.

The early years of synchrotron radiation research at NBS-SURF

This article is intended to celebrate 30 years of research using synchrotron radiation at the SURF facility of the National Bureau of Standards (NBS) latterly the National Institute of Science and Technology. At the same time it denotes the 30th anniversary of the publication of the first work [1] on atomic using this type of light source . When the ultraviolet radiation physics section of the Atomic Physics Division of NBS was formed in 1961, the theory of synchrotron radiation had been fully developed (see ref. [2] and references therein) . The radiation itself was first studied experimentally [3,4] in 1946 . The spectral and angular distributions of the radiation were subsequently measured photographically [5-7], as was the polarization of the radiation. Only one attempt had been made to study the radiation using the more definitive photoelectric technique [8] and the results indicated a considerable asymmetry in the angular distribution for both polarizations. The obvious reason for the interest of NBS in synchrotron radiation was that it ought to prove to be a fundamental standard of flux for the far ultraviolet . Indeed in 1955, in an all-too-brief period of access to the Cornell 300 MeV electron synchrotron, Tomboulian and Hartman [5] conducted experiments that showed conclusively that synchrotron radiation could be used as an intensity standard and as an important new source of continuum in the far ultraviolet. The situation with regard to the availability of laboratory sources was not particularly good. At wavelengths below the cut-off of the Hopfield continuum [9], approximately 600 Â, most sources required pulsed operation. Such sources generally had many emission lines from highly ionized species superimposed on the continuum. Moreover, the sputtered electrode and wall material tended to coat either entrance slit or pre-mirror. For example Garton [10] had developed a source of Lyman [111 continuum which was usable down to about 500 Â and the so-called BRV source had recently been reported to produce continuum to much shorter wavelengths [12] . Conventional X-ray sources produced a continuum at the longer wavelength, but these white X-rays were very weak [13] . There was, therefore, a need for a source of continuum that was

5390. Photoelectron spectroscopy of supersonic molecular beams: J E Pollard et al,Rev Sci Instrum,52 (12), 1981, 1837–1846

LBL-11250 ('., .:;-. IrnI Lawrence Berkeley Laboratory UNIVERSITY OF CALIFORNIA Materials & Molecular Research Division Presented at the VI International Conference on Vacuum Ultraviolet Radiation Physics, Charlottesville, VA, June 2-6, 1980 PHOTOELECTRONSPECTROSCOPV OF SUPERSONIC MOLECULAR BEAMS J.E. Pollard, D.J. Trevor, V.T. Lee, and D.A. Shirley June 1980 -.!>.. WREl\lCE AUG 15 1980 _.d:,r:MK) 1-\\\1 L.. '()C:UMENTS SECTl(J(i't; TWO-WEEK LOAN COpy This is a Library Circulating Copy which may be borrowed for two weeks. For a personal retention copy~ call Tech. Info. Division~ Ext. 6782. Prepared for the U.S. Department of Energy under Contract W-7405-ENG-48

Vacuum ultraviolet radiation physics, fifth international conference, Montpellier, 5–9 September 1977

Vacuum ultraviolet radiation physics, fifth international conference, Montpellier, 5–9 September 1977

Novel x‐ray spectroscopy probes complex molecules

When the Stanford Synchrotron Radiation Project began operating in May experimenters soon were able to demonstrate the great potential that such sources have for studying local atomic arrangements in complex molecules. The technique used goes by the forbidding name of “extended x‐ray absorption fine‐structure spectroscopy” or EXAFS. At the Fourth International Conference on Vacuum Ultraviolet Radiation Physics held in Hamburg, Germany, late in July, Peter Eisenberger (Bell Labs) discussed the EXAFS experiments done by a group that included himself, Brian Kincaid and Sally Hunter (Stanford), Dale Sayers and Edward A. Stern (University of Washington) and Farrel Lytle (Boeing Co.). Eisenberger told the meeting that the unique element‐specific nature of EXAFS shows promise of monitoring changes of environment in complex solids and in systems of interest to chemists and biologists.

IV. International Conference on Vacuum Ultraviolet Radiation Physics, Hamburg, West Germany : 22–26 July 1974

IV. International Conference on Vacuum Ultraviolet Radiation Physics, Hamburg, West Germany : 22–26 July 1974

22–26 July 1974 IV. International conference on vacuum ultraviolet radiation Physics, Hamburg, West Germany

22–26 July 1974 IV. International conference on vacuum ultraviolet radiation Physics, Hamburg, West Germany

22–26 July 1974 IV. International conference on vacuum ultraviolet radiation physics

22–26 July 1974 IV. International conference on vacuum ultraviolet radiation physics

Formula omitted] IV. International conference on vacuum ultraviolet radiation physics, Hamburg, West Germany

formula omitted] IV. International conference on vacuum ultraviolet radiation physics, Hamburg, West Germany

Ultraviolet radiation physics in astronomy and geophysics

The astrophysicist has been compelled, in his studies of the solar and stellar atmospheres, to abandon in some cases the simpler “local thermodynamic equilibrium” approach. The new approach assumes statistical equilibrium and writes equations which concern the transfer of energy. Details of the atomic and electronic collisions must be taken into account, along with the effects of the radiation field itself. The need for values of excitation, ionization, and similar cross sections is therefore of paramount importance. For studies of the corona where high ionization and excitation prevail, u.v. radiation is a pertinent factor. The appropriate laboratory and theoretical parameters are badly needed.Detailed studies of the photochemical reactions and ionization in the earth's upper atmosphere frequently touch on u.v. spectroscopic theory and data. In particular, the investigation of ionization rates has pointed out the need for accurate total absurption cross sections of molecules and atoms for u.v. radiation as well as the need for better ionization efficiencies. The range below 300 Å should be emphasized. Accurate solar absolute intensity data is lacking for the same regions.The improvement of optical instruments for the u.v. region is progressing, but more work remains to be done. The greatest lack seems to be the absence of good absolute calibration for intensity in the far u.v. The causes of some of the inadequacies of modern reflection gratings, including the echelle, should be found by laboratory research, and the remedies, if any, put into effect. Transmission and reflectivity research in the u.v. has already contributed notably to improvement in optical instrumentation. A good physics theory remains to be developed in this field, and basic laboratory research is in order.