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Primary and secondary droplet and charge transmission characteristics of desorption electro-flow focusing ionization
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10.1063/1.4807789
/content/aip/journal/apl/102/21/10.1063/1.4807789
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/21/10.1063/1.4807789

Figures

Image of FIG. 1.
FIG. 1.

Schematic representation of the electro-flow focusing ionization desorption-based ion source for mass spectrometry.

Image of FIG. 2.
FIG. 2.

Experimentally measured dimensionless secondary droplet current as a function of dimensionless voltage for a 50% (volume fraction) methanol solution in water sprayed onto a glass slide as a function of applied potential for a 50° angle, 70 kPa focusing gas pressure, and 3 L/min (-●-), 5 μL/min (-▪-), and 8 L/min (-▶-) flow rates. Data points and uncertainty expressed as the average values and standard uncertainties (represented by the standard deviation), respectively, for steady state currents obtained from 3 to 5 experiments.

Image of FIG. 3.
FIG. 3.

Experimentally measured dimensionless secondary droplet current as a function of dimensionless voltage for a 50% (volume fraction) methanol solution in water as a function of applied potential for a 50° angle, 70 kPa focusing gas pressure, and 5 L/min flow rate. Measured orifice current, collecting electrode current, and total electrified jet current for (a) secondary droplet deflection off of a glass slide (-◻-, -▪-, -♦-) and (b) primary droplet spraying directly (-△-,-▲-,- -), respectively. Black and gray dotted lines represent the empirical relationship between total jet current and applied voltage from Gañán-Calvo and the present study, respectively. Data points and uncertainty expressed as the average values and standard uncertainties (represented by the standard deviation), respectively, for steady state currents obtained from 3 to 5 experiments.

Image of FIG. 4.
FIG. 4.

Experimentally measured dimensionless secondary droplet current deflected off of an (●) aluminum, (▪) glass, and (♦) PTFE (Teflon®) substrate, as a function of dimensionless voltage for a 50% (volume fraction) methanol solution in water as a function of applied potential for a 50° angle, 70 kPa focusing gas pressure, and 5 L/min flow rate. Total electrified jet current ( ) and emitted primary droplet current (▲) also displayed. Black and gray dotted lines represent the empirical relationship between total jet current and applied voltage from Gañán-Calvo and the present study, respectively. Solid line at  = 1 represents the transition to electrospraying. Inset: normalized mass spectrometric total ion current for positive mode MS (cocaine analysis, -▪-) and negative mode MS (RDX analysis, -▲-) as a function of dimensionless voltage. Gray open diamond data points represent dimensionless deflected current from main figure for the PTFE substrate.

Tables

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Table I.

Material properties and charge relaxation time scales.

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/content/aip/journal/apl/102/21/10.1063/1.4807789
2013-05-28
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Primary and secondary droplet and charge transmission characteristics of desorption electro-flow focusing ionization
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/21/10.1063/1.4807789
10.1063/1.4807789
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