title: A fragmentation study of the Rhodamine 610 cation using visible-laser desorption ionization.
abstract: The fragmentation of a potential visible matrix-assisted laser desorption ionization: Rhodamine 610 was studied under 532 nm visible irradiation, as a function of anion counter ion. It was found that at a fixed fluence, the chloride salt produced fewer fragments than those formed with ClO(4)(-) or BF(4)(-). Evidence presented suggests that the degree of fragmentation is inversely proportional to the strength of the contact ion pair in the solid state; that is, more energy is deposited into the radical cation which can lead to fragmentation when less energy is required to separate the ion pair. Similar results were found for salts of Rhodamine 6G.
authors.affiliation: Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7.
authors.forename: C Y
authors.initials: CY
authors.lastname: Yang
authors.forename: X K
authors.initials: XK
authors.lastname: Hu
authors.forename: A V
authors.initials: AV
authors.lastname: Loboda
authors.forename: R H
authors.initials: RH
authors.lastname: Lipson
mesh_terms: D002412:Cations / Q000737:chemistry*; D012235:Rhodamines / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods*; D013696:Temperature
chemical_list: D002412:Cations; D012235:Rhodamines