TY - JOUR
T1 - Multiply-charged negative clusters of adenosine-5′-monophosphate in the gas phase
AU - Liu, Bo
AU - Hvelplund, Preben
AU - Nielsen, Steen Brøndsted
PY - 2005/11
Y1 - 2005/11
N2 - Multiply-charged noncovalent cluster anions of adenosine-5′- monophosphate (AMP) were formed by electrospray ionization (ESI). Ions in higher charge states were observed when the ions were accumulated in an ion trap with helium buffer gas before detection. We determined the smallest size (n a) or appearance size as a function of charge state (q), i.e., n a = 4 for q = 2, na = 8 for q = 3, and na = 13 for q = 4. The relation between na and q can be described by a charged droplet model. When the size is larger than na for a given q, the fragmentation pathway of an anion cluster is dominated by loss of neutral fragments. In contrast, when the size approaches the appearance size, only charged fragments are formed.
AB - Multiply-charged noncovalent cluster anions of adenosine-5′- monophosphate (AMP) were formed by electrospray ionization (ESI). Ions in higher charge states were observed when the ions were accumulated in an ion trap with helium buffer gas before detection. We determined the smallest size (n a) or appearance size as a function of charge state (q), i.e., n a = 4 for q = 2, na = 8 for q = 3, and na = 13 for q = 4. The relation between na and q can be described by a charged droplet model. When the size is larger than na for a given q, the fragmentation pathway of an anion cluster is dominated by loss of neutral fragments. In contrast, when the size approaches the appearance size, only charged fragments are formed.
UR - http://www.scopus.com/inward/record.url?scp=26944472815&partnerID=8YFLogxK
U2 - 10.1016/j.jasms.2005.07.021
DO - 10.1016/j.jasms.2005.07.021
M3 - Article
C2 - 16185890
AN - SCOPUS:26944472815
SN - 1044-0305
VL - 16
SP - 1840
EP - 1845
JO - Journal of the American Society for Mass Spectrometry
JF - Journal of the American Society for Mass Spectrometry
IS - 11
ER -