scholarly journals Performance of the VUV high-resolution and high-flux beamline for chemical dynamics studies at the Advanced Light Source

1996 ◽  
Author(s):  
Philip A. Heimann ◽  
Masato Koike ◽  
Chia Wei Hsu ◽  
Matt D. Evans ◽  
Cheuk Yiu Ng ◽  
...  
Keyword(s):  
High Resolution ◽  
Light Source ◽  
High Flux ◽  
Chemical Dynamics ◽  
Advanced Light Source

Performance of the vacuum ultraviolet high-resolution and high-flux beamline for chemical dynamics studies at the Advanced Light Source

1997 ◽  
Vol 68 (5) ◽  
pp. 1945-1951 ◽  
Author(s):  
P. A. Heimann ◽  
M. Koike ◽  
C. W. Hsu ◽  
D. Blank ◽  
X. M. Yang ◽  
...  
Keyword(s):  
High Resolution ◽  
Light Source ◽  
Vacuum Ultraviolet ◽  
High Flux ◽  
Chemical Dynamics ◽  
Advanced Light Source

scholarly journals Elucidating Chemical Structure at Station 11.3.1 at the Advanced Light Source

2014 ◽  
Vol 70 (a1) ◽  
pp. C1696-C1696
Author(s):  
Kevin Gagnon ◽  
Christine Beavers ◽  
Gregory Morrison ◽  
James Nasiatka ◽  
Simon Teat
Keyword(s):  
Light Source ◽  
Gas Flow ◽  
Structural Information ◽  
Spot Size ◽  
Complex Compounds ◽  
High Flux ◽  
Advanced Light Source ◽  
Recent Developments ◽  
Diamond Anvil ◽  
Focused Beam

One of the greatest challenges facing crystallographers has always been how to collect good data. This has become especially challenging as chemists are creating more complex compounds and looking to extract new exotic structural information from crystals which are getting smaller and smaller. Often, these crystals produce little or no diffraction on a laboratory diffractometer with long exposures. The past two decades have provided world-class synchrotron facilities to help solve these problems through a combination of high flux and a small focused beam spot size. Station 11.3.1 at the Advanced Light Source is a dedicated chemical crystallography beamline which has been developed and improved over the last decade to provide a global user base with a high flux, focused beam which is capable of doing more than just providing excellent data on weakly diffracting samples. Recent developments on station 11.3.1 include an environmental gas cell for studying of samples under evacuation, up to 1 atm of gasses and mixtures of gasses, and under gas flow; a diamond anvil cell for studying samples under applied pressures up to 10 GPa, a photodiode array for in-situ photocrystallography, as well as a tunable monochromator allowing energies between 6.5 and 22 keV. This poster will showcase the recent changes to station 11.3.1 as well as the future plans for upgrades.

scholarly journals A differentially pumped harmonic filter on the Chemical Dynamics Beamline at the Advanced Light Source

1995 ◽  
Vol 66 (10) ◽  
pp. 4841-4844 ◽  
Author(s):  
Arthur G. Suits ◽  
Philip Heimann ◽  
Xueming Yang ◽  
Matt Evans ◽  
Chia‐Wei Hsu ◽  
...  
Keyword(s):  
Light Source ◽  
Chemical Dynamics ◽  
Harmonic Filter ◽  
Advanced Light Source

K-shell photoionization of Li, Be+ and B2+

2016 ◽  
Vol 30 (15) ◽  
pp. 1650204 ◽  
Author(s):  
Jun Li ◽  
Jian Dang Liu ◽  
Song Bin Zhang ◽  
Bang Jiao Ye
Keyword(s):  
High Resolution ◽  
Light Source ◽  
Cross Sections ◽  
Ground State ◽  
Matrix Method ◽  
Theoretical Calculations ◽  
Metastable States ◽  
The Core ◽  
Advanced Light Source ◽  
State Formula

K-shell photoionization (PI) of Li, Be[Formula: see text] and B[Formula: see text] from ground state [Formula: see text] have been studied by using the [Formula: see text]-matrix method with pseudostates. The K-shell PI process is featured with the contributions from the core-excited metastable states or dominated by the Auger states 2Po. The resonant parameters of the Auger states 2Po and the PI cross-sections have been calculated and compared with the available experimental and theoretical works. Our results agree very well with that of the published works. It is worth noting that compared with previous theoretical calculations, our results of B[Formula: see text] show better agreements with the latest high-resolution advanced light source measurements [A. Müller et al., J. Phys. B 43 (2010) 135602].

scholarly journals Chemical Dynamics at the Advanced Light Source

10.2172/6536 ◽  
1999 ◽  
Author(s):  
T. Baer ◽  
N. Berrah ◽  
C. Fadley ◽  
C.B. Moore ◽  
D.M. Neumark ◽  
...  
Keyword(s):  
Light Source ◽  
Chemical Dynamics ◽  
Advanced Light Source

Advanced microscopy—the new high-resolution zone-plate microscope at the advanced light source in Berkeley

1995 ◽  
Vol 53 ◽  
pp. 112-113
Author(s):  
W. Meyer-Ilse ◽  
H. Medecki ◽  
C Magowan ◽  
R. Balhorn ◽  
M. Moronne ◽  
...  
Keyword(s):  
High Resolution ◽  
Radiation Dose ◽  
Light Source ◽  
Incoherent Light ◽  
X Ray ◽  
Optical Layout ◽  
Advanced Light Source ◽  
Valuable Complement ◽  
Conventional Type ◽  
Transmission Microscope

A new x-ray microscope (XM-1) has been installed at the Advanced Light Source in Berkeley. This transmission microscope uses zone-plates for a resolution exceeding visible light microscopies. Samples can be as thick as 10 microns, for wet or dry specimens. These features make x-ray microscopy a valuable complement to other advanced techniques.There are two types of x-ray microscopes, scanning and conventional (imaging) microscopes. The scanning type minimizes radiation dose to the sample and is convenient for high resolution use of fluorescent labels; however, it requires a spatially coherent x-ray source and as a result involves long exposure times. The conventional type provides a higher potential for ultimate resolution as there is no scanning stage needed, and it can operate with an incoherent light source. It therefore has a shorter exposure time, but does require a higher radiation dose due to lens inefficiencies. The new XM-1 is of the second type. Its optical layout is very similar to the Gottingen x-ray microscope operated at the BESSY facility in Berlin, Germany.

scholarly journals High‐resolution beamline 9.3.2 in the energy range 30–1500 eV at the Advanced Light Source: Design and performance

1996 ◽  
Vol 67 (9) ◽  
pp. 3372-3372 ◽  
Author(s):  
Z. Hussain ◽  
W.R.A. Huff ◽  
S.A. Kellar ◽  
E.J. Moler ◽  
P.A. Heimann ◽  
...  
Keyword(s):  
High Resolution ◽  
Energy Range ◽  
Light Source ◽  
Advanced Light Source ◽  
And Performance

Studies of the single and double photoionization of two-electron systems at the Advanced Light Source

1996 ◽  
Vol 74 (11-12) ◽  
pp. 713-721 ◽  
Author(s):  
Michael S. Lubell
Keyword(s):  
High Resolution ◽  
Light Source ◽  
Resolving Power ◽  
Electron Interaction ◽  
Threshold Region ◽  
Spectral Brightness ◽  
Operating Characteristics ◽  
Relative Contribution ◽  
Ionic Systems ◽  
Advanced Light Source

The Advanced Light Source (ALS) at Lawrence Berkeley Laboratory is a "third generation" synchrotron radiation machine that incorporates wigglers and undulators to enhance the spectral brightness of the emitted radiation. Commissioned in October 1993, its performance to date has been nothing short of spectacular. Its demonstrated characteristics make it an ideal tool for carrying out high resolution measurements of photoionization studies of two-electron atomic and ionic systems. ALS Beamline 9.0.1, a facility dedicated to the study of photoprocesses in atoms, molecules, and ions, utilizes an undulator with an 8 cm period and a monochromator with spherical gratings to produce light at energies between 20 and 300 eV. At a photon energy of, 50 eV, the beamline is designed to deliver about 1.5 × 1013 photons/s into a spot measuring approximately 50 × 800 μm with a resolving power of 10 000. Measurements of low-lying autoionizing resonances in He, carried out shortly after the ALS was commissioned, provided the first confirmation of the essential beamline characteristics. The 1.0 meV line width, more recently observed for the 2p3d double-excitation state of He at 64.12 eV, demonstrates that the actual resolving power of the beamline far exceeds the design value. The properties of the ALS, combined with improvements in the reliability and operating characteristics of ion sources, make it possible to extend high-resolution synchrotron experiments beyond the study of neutral systems. Investigations of low-Z ions are important, because they provide an easy way to vary the relative contribution of the electron–electron interaction. An international collaboration has recently been formed to perform such studies. Its list of priorities includes the doubly excited spectra and the threshold region for two-electron photoionization in Li+ and H−. Metastable He*, formed by resonant charge transfer from He+, will provide access totriplet states.

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