Constant deviation monochromator for the range 100 Å≤λ≤1000 Å

Abstract

A grazing incidence constant deviation monochromator with a spherical concave grating was fabricated for use with undulator radiation. It has a simple scanning mechanism with fixed entrance and exit slits, as wen as fixed directions of incident and exit beams. It has been installed into an undulator beamHne at IMS. Synchrotron radiation from a bending section also can be introduced into the monochromator by using premirrors. The energy resolution of the monochromatoris better than 70 meV at the photon energy of94 e V with lO-pm slits, when the bending magnet synchrotron radiation is used. The spot size of the zeroth-order light is 1.5(v) X2.0(h) mm 2 at the distance of 1.85 m behind a postmirror. The photon flux of the undulator radiation behind the exit slit is approximately 1 X 10 12 photons/s at the peak, when both the entrance and exit slits are 100 pm (IlE = 0.08 e V) and the stored current is 50 mAo 2105Rev. Sci. Instrum. 60 (7),

MERLIN — A meV Resolution Beamline at the ALS

“…The monochromator chosen for the MERLIN beamline is a quasi-Rowland circle instrument with fixed entrance and exit slits similar to those described by Ishiguro et al [2] and by Senf et al [3] In its basic configuration, [2,3] a plane mirror at a fixed angle of incidence is used together with the grating to keep the incident and diffracted beams parallel. The energy scanning is performed by rotating the grating and translating the two elements along the incident beam.…”

Dissociative Multiple Ionization following Valence, Br(3d), and Si(2p) Inner Shell Photoexcitation of SiBr4 in the Range of 30−133 eV

“…The time-of-flight (TOF) mass spectrometer is coupled to a constant-deviation grazing incidence monochromator installed at the BL3A2 beam line of the Ultraviolet Synchrotron Orbital Radiation (UVSOR) facility in Okazaki. The principle and construction of the whole apparatus have been described in detail previously. , One feature of the TOF mass spectrometer is that the length of the field-free tube is adjustable, which facilitates the detection of metastable ions and makes possible to obtain better mass-resolved spectra. In addition, the mass detection angle can be varied by rotating the mass spectrometer in the plane perpendicular to the direction of incident photon beam.…”

Dissociative Multiple Ionization Following Valence and Si:2p Core Level Photoexcitation of HSi(CH3)3 in the Range 38−133 eV

“…The present experiments were carried out by using a time-of-flight (TOF) mass spectrometer, coupled to a constant-deviation grazing incidence monochromator installed at the BL3A2 beam line of the ultraviolet synchrotron orbital radiation (UVSOR) facility in Okazaki. The design and construction of the apparatus have been described in detail elsewhere , and briefly described here. The time-of-flight mass spectrometer employs a drift tube of adjustable length for a facile detection of metastable ions or to obtain better resolved mass spectra.…”