Collision cross sections (in Ų) of singly-protonated polyaminoacids. ^a

n^b	Glyn^c	Alan	Valn	Thrn	Ilen	Leun	Glnn	Lysn	Hisn	Phen	Trpn
2	62		86.5		98.2		100.0	99.2	98.7		122.3
3	76	89.0	116.3		128.0		125.9	133.4	128.5	137.8	155.8
4	86	102.9	136.1		155.4	157.8	147.8	157.8	154.2	168.6	192.3
5	97	115.0	155.0		174.5	181.3	169.0	180.5	179.8	200.0	214.6
6	107	127.0	176.2		199.6	204.5	190.4	209.9	197.2	224.8	249.3
7		140.5	188.8				208.3	231.3	213.8	247.1	268.3
8		155.5		202.8		257.5	225.4	253.6	234.6		296.1
9		167.9		216.1		273.2		271.1			317.7
10		179.3		233.8
11		192.2		246.8
12		202.4		263.5
13		214.9		280.0
14		224.9		291.5
15		235.2
16		247.4
17		256.2
18		265.0
19		276.3

^aUnless otherwise noted, values listed here were recorded by Henderson et al. using an ion trap/ion mobility/time-of-flight instrument (Henderson, S. C.; Li, J.; Counterman, A. E.; Clemmer, D. E., J. Phys. Chem. B 1999, 103, 8780.

^bNumber of residues in the polyaminoacid.

^cReported by Wyttenbach, T.; Bushnell, J. E.; Bowers, M. T. J. Am. Chem. Soc. 1998, 120, 5098.