This study is aimed at the explanation of peculiarities in emission spectral profiles obtained by different authors for the excimer band HgXe(A30+) - HgXe(X10+). The calculations of the spectral profiles have been fulfilled for two limiting cases: for the high density and low density of buffer gas atoms. The results obtained lead to the conclusion that the discrepancies can be mainly caused by the recombination and relaxation processes determining the population ro-vibrational states of the HgXe(A30+) excimer. The inverse spectroscopic problem is considered.