Say Goodbye to Either/Or Electrochemistry
Square Wave Stripping "D ppb Lead Mercury Microelecrrode
549
31
Au 2 . 1 5 8 x 1 0 e 11
69 Ga 1.64 x 1 0 s 315
58
Ni 1.062 x 1 0 4 731
Au 1.30x106376
ost electrochemical software is designed to do either sophisti cated research or routine measure ments. In the past, if your lab did both, you were stuck.
M
Sum of neutrals 4.012 x 1 0 e
Either you had to buy two separate packages, which meant satisfying the compatibility requirements for both and learning two very different environments. Or you had to buy one package and make do.
Sum of neutrals 1.98x10e
Well say goodbye to either/or electro chemistry. The Model 270 Electro chemical Analysis software from EG&G Princeton Applied Research is unmatched on all counts—power, versatility, and ease of use.
Figure 9. Laser SNMS images of a Au structure on GaAs. Field of view for top two rows is 40 χ 40 μηι 2 ; for bottom row, 1 4 x 1 4 μιτι2.
ples. Finally, considering the unique surface analytical features of molec ular surface MS, much more funda mental research on the most impor t a n t p r o c e s s of m o l e c u l a r ion formation is required. We thank K. Meyer and M. Terhorst for support and discussions, and J. Lub of Philips Research Laboratories (Eindhoven, The Netherlands) for providing the poly(hydroxyethylmethacry!ate). m: 104.05
Repeat unit
187
5.129 χ 10 5
Figure 10. Laser SNMS image of polystyrene dots on a silicon surface. Field of view is 25 χ 25 μηι 2 . Spectra acquisition conditions are the same as in Figure 9, with the laser power density reduced by a factor of 5. (Details of the experiment are found in Ref. 38.)
m i z a t i o n of l a s e r p o s t i o n i z a t i o n equipment, and on-line combination with other techniques such as XPS, S T M , or A F M . N e w m e t h o d s for cleaning, sectioning, a n d s t a i n i n g must be developed before the tech nique can be used for biological sam
References (1) Woodruff, D. P.; Delchar, T. A. Modern Techniques of Surface Science; Cambridge University Press: Cambridge, 1986. (2) Czanderna, A. W.; Hercules, D. M. Ion Spectroscopies for Surface Analysis; Plenum Press: New York, 1991. (3) Fuchs, H.; Ohst, H.; Prass, W. Adv. Mater. 1991, 3, 10. (4) Wegner, G. Adv. Mater. 1991, 3, 8. (5) Benninghoven, Α.; Rudenauer, F. G.; Werner, H. W. Secondary Ion Mass Spec trometry; John Wiley & Sons: New York, 1987. (6) Sigmund, P. Phys. Rev. 1969, 184, 383; 187, 768. (7) Winograd, N.; Garrison, B. J. In Ion Spectroscopies for Surface Analysis; Czanderna, A. W.; Hercules, D. M., Eds.; Cambridge University Press: Cambridge, 1986; pp. 45-142. (8) Whitlow, H. J.; H a u t a l a , M.;
Consider just this small selection of Model 270 advantages: • Both time-tested hardware (Model 273 Potentiostat) and state-of-theart computer environment (IBM platform, pull-down menus) • Automatic control of both the PARC Model 303ASMDE and a se lection of microelectrodes • Traditional voltammetry/polarography and fast Square Wave • Easy-to-learn Standard Mode for routine use and feature-rich Expert Mode for finer experimental control So if you typically do ground-break ing research one day and routine measurements the next, say hello to total electrochemistry. Call for infor mation today at 1-609-530-1000.
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ANALYTICAL CHEMISTRY, VOL. 65, NO. 14, JULY 15, 1993 · 639 A
