Neutralization-reionization mass spectrometry (NRMS). Structural information from vertical neutralization and reionization efficiencies

✍ Scribed by Chrysostomos Wesdemiotis; Rong Feng; Evan R. Williams; Fred W. McLafferty

• Book ID: 102965647
• Publisher: John Wiley and Sons
• Year: 1986
• Tongue: English
• Weight: 802 KB
• Volume: 21
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/oms.1210211014

✦ Synopsis

The neutralization-reionization mass spectra of alkane radical ions indicate significant differences between the structures and geometries of alkane molecules and their molecular ions, confirming recent ab initio predictions. Ionic isomers that are indistinguishable by collisionallyactivated dissociation because of easy interconversion can be characterized by neutralization-reionization if the corresponding neutrals show different reactivities, as is demonstrated for the [C,H,]+/C,H,' system and for [CzWOz]+' isomers. For identification of mixtnres of more than one neutral species, the relative efficiency for reionizing each neutral must be determined; e.g. the 0, reionization efficiency of 'CH,OH radicals is -4 times greater than that of CH,O'. This information and reference reionization spectra of CH,O' and 'CH20H show that metastable or collisionally activated methyl acetate cations lose CH,O', not 'CH,OH as previously reported; the newly-formed CH,O' undergoes partial (-20%) isomerization to 'CH,OH in the s before reionization. Sdar results are obtained for [B(OCH,),]+'.