Table 1: Calculated grazing velocities for a maximum yield of a1-fragment cations from oligopeptide cations grazing along a hydrocarbon surface. Some amino acids can produce a1-fragment cations at two different grazing velocity intervals.

Amino acid (j) of fragment NH2+–CHR Number of CH dipoles in antenna of Calculated grazing velocities [104 m/s]

Alanine (A)444
Arginine (R)1297
Asparagine (N)873 ;
Aspartic Acid (D)883 ;
Cysteine (C)763 ;
Glutamic Acid (E)1025
Glutamine (Q)1015
Glycine (G)302 ;
Histidine (H)1103 ;
Isoleucine (I)868
Leucine (L)868
Lysine (K)1019
Methionine (M)1045
Phenylalanine (F)1203 ;
Proline (P)707
Serine (S)603 ;
Threonine (T)742 ;
Tryptophan (W)1593 ;
Tyrosine (Y)1363 ;
Valine (V)726