Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) Theoretical collection efficiencies of the three rings of the VDA. The black outline is the unpolarized scattering intensity of a 2 µm silica sphere in cytoseal at 550 nm. (b) Schematic for the 87-channel MARDI microscope. Mchrm. = monochromator, VDA = variable dark-field aperture, Obj. = objective.
