Ion Transport Efficiency
The efficiency of ion transport achieved with the use of the elliptical electrode assembly was explored by spraying a known amount of rhodamine B solution (1 mM)
Fig. 2.2 Intensity profile of ion beam exiting ellipse in arrangement shown in Fig. 2.1, with the grounded aluminum plate replaced by an IonCCD detector. Potentials on ellipse and sprayer were 4 and 5 kV, respectively. Experimental setup for profiling experiment is shown in the right segment of figure
at different distances from the counter electrode (grounded aluminum plate) with and without the use of the elliptical electrode. The ions created were directed to and collected on the grounded aluminum plate. The material deposited on a square 1 cm2 area corresponding to the most intense region of each deposited spot was redissolved in 1:1 methanol:water (v:v) and the solutions were analyzed for concentration by UV- Vis spectrophotometry, by employing standards of known concentration to construct a calibration curve. Quantitation was based on maximum absorbance at a wavelength of 551 nm where the molar absorptivity is 105,700 M-1 cm-1.