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Stray Radiant Energy in Optical-Null Spectrometry

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The method to determine the relative stray radiant energy (SRE) in UV spectrometry, which was described by Mielenz et al., may be adapted to apply to optical-null spectrophotometers for all possible reference cell to-sample-cell thickness ratios less than unity [i.e., β (=b r /b s ) < 1] and to include situations where the "cutoff" solution is not transparent to SRE. If the same cutoff solution is placed in both cells but the sample cell is β-times as thick as the reference cell, then the transmittance ratio (τ'λ) of the sample solution relative to the reference solution in the presence of a SRE level x is given by:

τ'λ = τλ + tx)/τλ β + tβτ'λ x)       (1)

where τλ is the true instantaneous transmittance of the sample-beam solution to monochromatic light of wavelength λ, and t is its transmittance to SRE.

Keywords: Infrared; Instrumentation, spectrophotometric; UV-visible spectroscopy

Document Type: Short Communication

DOI: http://dx.doi.org/10.1366/0003702904086209

Affiliations: Sligo Regional Technical College, Sligo, Ireland

Publication date: March 1, 1990

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