Optimum microsampling demands minimization of the beam diameter of a spectrometer, which because of throughput conservation implies beam convergence maximization. The required low focal ratio optics will then be aberration-limited.
Tomas Hirschfeld, "Inmersion Microsampling for Fourier Transform Infrared Spectroscopy," Appl. Spectrosc. 31, 550-551 (1977)
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