Comparison of the internal energy deposition of direct analysis in real time and electrospray ionization time-of-flight mass spectrometry View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2010-05

AUTHORS

Glenn A. Harris, Dana M. Hostetler, Christina Y. Hampton, Facundo M. Fernández

ABSTRACT

The internal energy (E(int)) distributions of a series of p-substituted benzylpyridinium ions generated by both direct analysis in real time (DART) and electrospray ionization (ESI) were compared using the "survival yield" method. DART mean E(int) values at gas flow rates of 2, 4, and 6 L min(-1), and at set temperatures of 175, 250, and 325 degrees C were in the 1.92-2.21 eV range. ESI mean E(int) at identical temperatures in aqueous and 50% methanol solutions ranged between 1.71 and 1.96 eV, and 1.53 and 1.63 eV, respectively. Although the results indicated that ESI is a "softer" ionization technique than DART, there was overlap between the two techniques for the particular time-of-flight mass spectrometer used. As a whole, there was an increase in E(int) with increasing reactive and drying gas temperatures for DART and ESI, respectively, indicating thermal ion activation. Three dimensional computational fluid dynamic simulations in combination with direct temperature measurements within the DART ionization region revealed complex inversely coupled fluid-thermal phenomena affecting ion E(int) values during atmospheric transport. Primarily, that DART gas temperature in the ionization region was appreciably less than the set gas temperature of DART due to the set gas flow rates. There was no evidence of E(int) deposition pathways from metastable-stimulated desorption, but fragmentation induced by high-energy helium metastables was observed at the highest gas flow rates and temperatures. More... »

PAGES

855-863

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1016/j.jasms.2010.01.019

DOI

http://dx.doi.org/10.1016/j.jasms.2010.01.019

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1025352621

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/20181493


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42 schema:description The internal energy (E(int)) distributions of a series of p-substituted benzylpyridinium ions generated by both direct analysis in real time (DART) and electrospray ionization (ESI) were compared using the "survival yield" method. DART mean E(int) values at gas flow rates of 2, 4, and 6 L min(-1), and at set temperatures of 175, 250, and 325 degrees C were in the 1.92-2.21 eV range. ESI mean E(int) at identical temperatures in aqueous and 50% methanol solutions ranged between 1.71 and 1.96 eV, and 1.53 and 1.63 eV, respectively. Although the results indicated that ESI is a "softer" ionization technique than DART, there was overlap between the two techniques for the particular time-of-flight mass spectrometer used. As a whole, there was an increase in E(int) with increasing reactive and drying gas temperatures for DART and ESI, respectively, indicating thermal ion activation. Three dimensional computational fluid dynamic simulations in combination with direct temperature measurements within the DART ionization region revealed complex inversely coupled fluid-thermal phenomena affecting ion E(int) values during atmospheric transport. Primarily, that DART gas temperature in the ionization region was appreciably less than the set gas temperature of DART due to the set gas flow rates. There was no evidence of E(int) deposition pathways from metastable-stimulated desorption, but fragmentation induced by high-energy helium metastables was observed at the highest gas flow rates and temperatures.
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