Gubbens A.,Gatan Research and Development |
Barfels M.,Gatan Research and Development |
Trevor C.,Gatan Research and Development |
Twesten R.,Gatan Research and Development |
And 6 more authors.
Ultramicroscopy | Year: 2010
We describe a new post-column imaging energy filter for (scanning) transmission electron microscopy from 60 to 300. kV operating voltage. The completely redesigned GIF quantum has a gradient magnetic prism, dodecapole optics, a 10-times faster 40. Mpixel/sec CCD camera, a 1 γs electrostatic shutter, and new user interface, control, and auto-alignment software. An 8 dodecapole lens system, performs full 2nd and 3rd, and partial 4th and 5th order aberration correction. The improved aberration correction has allowed the size of the entrance aperture to be nearly doubled to 9.0. mm compared to current generation post-column designs. The electrostatic shutter provides exposure control down to 1 γs, extending the exposure time range to over 7 orders of magnitude. Spectroscopy operation has been improved with a larger 2. keV field of view at 200. kV, and a maximum acquisition rate of 1000 spectra per second. A high-speed DualEELS mode simultaneously acquires core- and low-loss spectra up to 2. keV apart. A more intuitive user interface includes new capabilities such as automated exposure control and optimized full spectrum acquisition. The auto-alignment software has been significantly enhanced to use the full flexibility of the dodecapole lens system. © 2010 Elsevier B.V.