Spectroscopy-05-01-2007

Spectroscopy

Market Profile: Electron Transfer Dissociation (ETD)

May 01, 2007

Departments

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Electron transfer dissociation, generally referred to as ETD, is a new fragmentation technique that is associated with ion trap LC–MS instrumentation. Despite being widely introduced less than two years ago, demand for the technique is increasing rapidly.

Corrections to Analysis of Noise: Part I

May 01, 2007

Chemometrics in Spectroscopy

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Columnists Howard Mark and Jerome Workman, Jr. respond to reader feedback regarding their 14-part column on the analysis of noise in spectroscopy by presenting another approach to analyzing the situation.

Basic Fundamental Parameters in X-Ray Fluorescence

May 01, 2007

Articles

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The "fundamental parameters" approach to calibration in X-ray fluorescence is unique because it is based upon the theoretical relationship between measured X-ray intensities and the concentrations of elements in the sample. This theoretical relationship is based upon X-ray physics and the measured values of fundamental atomic parameters in the X-ray region of the electromagnetic spectrum. In this tutorial, an introduction to the means of calibration is provided based upon a simplified instrument–sample geometry, thus eliminating some of the mathematical details of the traditional derivations.