Grazing Molecule Excitation as a Tool to Analyse the Amino Acid Sequence in Oligopeptides

Table 1

Calculated grazing velocities 𝜐_gr^max 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)	𝑚/𝑧 of fragment NH2^+–CHR1𝑗	Number of CH dipoles in antenna of R1𝑗	Calculated grazing velocities 𝜐gr^max [10^4 m/s]
Alanine (A)	44	4	0.70±0.05
Arginine (R)	129	7	0.50±0.05
Asparagine (N)	87	3	1.00±0.10; 1.50±0.10
Aspartic Acid (D)	88	3	1.00±0.10; 1.50±0.10
Cysteine (C)	76	3	1.00±0.10; 1.50±0.10
Glutamic Acid (E)	102	5	0.65±0.05
Glutamine (Q)	101	5	0.65±0.05
Glycine (G)	30	2	1.00±0.10; 1.60±0.10
Histidine (H)	110	3	1.00±0.10; 1.50±0.10
Isoleucine (I)	86	8	1.60±0.05
Leucine (L)	86	8	1.60±0.05
Lysine (K)	101	9	1.90±0.05
Methionine (M)	104	5	0.65±0.05
Phenylalanine (F)	120	3	1.00±0.10; 1.50±0.10
Proline (P)	70	7	0.50±0.05
Serine (S)	60	3	1.00±0.10; 1.50±0.10
Threonine (T)	74	2	1.00±0.10; 1.60±0.10
Tryptophan (W)	159	3	1.00±0.10; 1.50±0.10
Tyrosine (Y)	136	3	1.00±0.10; 1.50±0.10
Valine (V)	72	6	0.60±0.05