- Workman Jr., Jerry & Art Springsteen, "Applied Spectroscopy: A Compact Reference for Practitioners", p. 19-21, 1997.
broadening of a line spectrum through the spectrometer is an illustration of the spectrometer bandpass. The actual bandpass for any instrument is assigned a value by determining the FWHM height of the bell-shaped spectrum. Thus, for the band in Fig. 9, the FWHM could be empirically determined by finding the wavelength at which maximum intensity occurs and measuring the peak height at this position. This height measurement is divided in half and the bandwidth is measured at this half-height on the band as illustrated in Fig. 10.
To summarize, bandpass and resolution are identical in practice. Only for the resolution specification of a spectrometer is the expression of bandpass under the specified measuring conditions of an instrument dependent on the slit width settings.