“…There are two experimental methods devoted to detection of LIF dispersed emission spectra with the use of: i) a tuneable monochromator in front of a photocathode of a photomultiplier tube (PMT) -the method which is limited by a considerable time consumption during the experiment, especially when a large spectral range is scanned over (see e.g., [36]), or ii) a spectrometer fitted with an iCCD camera (see e.g., [37]) -the method in which the whole spectrum is recorded at once without a necessity of executing the time-consuming scans.…”