Swept electron beam rapid scan spectrophotometer. Qualitative aspects

Abstract

A swept electron beam rapid scan spectrophotometer has been built in this laboratory. This device utilizes techniques which were originally intended for video applications.

Evaluation of a vidicon scanning spectrometer for ultraviolet molecular absorption spectrometry

“…The tube is useful for spectral studies between 200 and 1100 nm with scan times down to 4 msec. This paper includes quantitative data similar to those reported earlier for the visible region (5) and identifies the magnitudes of 1 Present address, Department of Chemistry, State University of New York at Buffalo, Buffalo, N.Y.…”

“…10 and the S°t, i and S°r, 1/2 are values of the proportional and square root coefficients at T = 1.00. The total variance in transmittance can be expressed as Sr2 = (Sr>0°)2 + (Sr|1°D2 + (5 |1/2° 1/2)2 (1) and the error coefficients, S°t,o S°t, 1, and S°t, 1/2, can be evaluated by a least squares fit of variances at several values of transmittance to this equation. We proceed first to identify in a general way the types of errors expected for this vidicon spectrometer and then to present data which quantify some of these sources.…”

“…Subsequent to that report, review articles appeared which included experimental data to further demonstrate the potential of these devices (2, 3). More recently, a series of papers describing applications to stoppedflow kinetic studies of fast reactions involving transient intermediates (4, 5), and simultaneous determination of multiple elements by atomic absorption and emission spectrometry (5-8) have confirmed the projections made in that early report (1).…”

“…A previous report from this laboratory summarized early applications of array detectors for rapid scanning spectrometry and presented qualitative and quantitative data from an operating vidicon spectrometer which demonstrated the potential of these devices for analytical spectrometry (1). Subsequent to that report, review articles appeared which included experimental data to further demonstrate the potential of these devices (2, 3).…”

Effects of pH and chelating agent on the NiWS phase formation in NiW/γ-Al2O3 HDS catalysts

“…Furthermore, the absorbance between 500 and 685 nm, corresponding to distortion of octahedral symmetry (D 4h ) in the Ni-CyDTA complex, is similar for all NieCyDTA solutions prepared in the entire range of pH. Erickson et al [30] and Santini et al [31] studied the Ni-CyDTA complex with nuclear magnetic resonance and UVeVis, finding only one type of complex, [Ni(CyDTA)] 2À .…”