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Response function with luminescence standards

KJ Frost, RL McCreery. Calibration of Raman spectrometer instrument response function with luminescence standards An update. Appl Spectrosc 52 1614-1618, 1998. [Pg.157]

Recalibration of the instrument response function reduces or eliminates most of the instrumental factors that lead to relative intensity variations over time. For example, a luminescent standard could be used at the beginning of each session as described in Section 10.3.3. Use of the same standard and correction procedure during qualification could establish the true value of one or more peak ratios for future reference. Table 10.9 shows results for this approach applied to the example of calcium ascorbate. The ratio of the 767- and 1587 cm" peak intensities was monitored after calibration of the response function with a luminescent standard. The standard deviations listed in Table 10.9 for the 767/1582 peak height ratio provide indications of the reproducibility of the response correction and sample spectra. [Pg.284]

Luminescent standards have been established for use in calibrating fluorescence spectrometers and have been suggested for Raman spectroscopy in the past (18). The standard is a luminescent material, usually a solid or liquid, that emits a broad reproducible luminescence spectrum when excited by a laser. Once the standard is calibrated for a particular laser wavelength, its emission spectrum is known, and it can provide the real standard output , d)i(AF) depicted in Figure 10.8. In practice, a spectrum of the standard is acquired with the same conditions as an unknown then the unknown spectrum is corrected for instrument response function using the known standard... [Pg.275]

Figure 10.12. Correction for vial absorption using luminescent standard. Upper drawing shows 180° sampling of a powder inside an amber vial. Lower drawing is the same arrangement, but with a luminescent standard suhstituted for the sample, to correct the response function for vial absorption. Figure 10.12. Correction for vial absorption using luminescent standard. Upper drawing shows 180° sampling of a powder inside an amber vial. Lower drawing is the same arrangement, but with a luminescent standard suhstituted for the sample, to correct the response function for vial absorption.
Execute procedure for response function calibration with tungsten source or luminescent standard. Acquire corrected spectrum of cyclohexane (or an alternative standard) and compare relative peak areas to established values. Store corrected spectrum. [Pg.290]


See other pages where Response function with luminescence standards is mentioned: [Pg.198]    [Pg.209]    [Pg.275]    [Pg.279]    [Pg.263]   
See also in sourсe #XX -- [ Pg.278 , Pg.279 ]




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