Thermal radiation-induced dissociation

Our group has termed this process zero pressure thermal-radiation-induced dissociation (ZTRID). 

The observation of blackbody-radiation-induced thermal dissociation of gaseous cluster ions suggests that very low power, CW infrared laser irradiation should also... 

In addition, new tandem mass spectrometry technologies were also among the important innovations. Apart from traditional collision-induced dissociation (CID) [89-91], a variety of activation methods (used to add energy to mass-selected ions) based on inelastic collisions and photon absorption have been widely utilized. They include IR multiphoton excitation [92,93], UV laser excitation [94—97], surface-induced dissociation (SID) [98-100], black body radiation (101, 102], thermal dissociation [103], and others. As the fragmentation of peptide/protein ions is a central topic in proteomics, there is strong interest in such novel ion dissociation methods as electron capture dissociation (ECD) [104, 105] and electron transfer dissociation [22]. These new methods can provide structural information that complements that obtained by traditional collisional activation. Also, very recently, ambient ion dissociation methods such as atmospheric pressure thermal dissociation [106] and low temperature plasma assisted ion dissociation [107] have been reported. 

The thermal-induced dissociation of tetraethylsUyl cations, SiEt4+ , has been reported by Lin and Dunbar. This technique which makes use of the blackbody background radiation field for the dissociation of a weakly bound cluster allows for the study of weakly bound clusters with dissociation energies in the range of 0.5 to 1 eV. Thus, by measuring the rate constants for the loss of an ethyl radical from SiEtj" , a heat of formation of 131.7 2 kcalmol i was derived for the SiEt3+ ion. 

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