Electron Microprobe Facility

 

Lab location: Rm 621 in POST building Phone:  (+1) 808-956-9406 Fax: (+1) 808-956-5512 Mailing address: Department of Geology and Geophysics University of Hawaii 1680 East-West Road / POST 606 Honolulu, Hawaii 96822 USA

 

JEOL Hyperprobe JXA-8500F

Technical Specifications

• Five WDS spectrometers with the following configuration:

Spectro 1      TAP     PET    LDE1   LDE2    (Gas flow)

Spectro 2      PETH   LIFH                        (Sealed xenon)

Spectro 3      TAP     PET                         (Gas flow)

Spectro 4      PET     LIF                          (Sealed xenon)

Spectro 5      TAPH  PETH                        (Gas flow)

• Thermo-Noran System Six EDS with 128eV SDD detector (liquid N2-free)
• Gatan Mini-CL cathodoluminescence detector
• High spatial resolution achieved through a Schottky-type field-emission gun, resulting in a highly focused (30-50 nm) electron beam on the sample surface
• High-precision stage with optical encoders (reproducibility about 0.2 microns)
• Sample holders for rectangular thin sections (25 x 48 mm) and 1-inch rounds

 

Software:

- Quantitative

The JEOL operating software is solid and easy to use, but we chose to do our quantitative WDS analyses using a third-party software designed by John Donovan (Probe for EPMA software). It offers unique and powerful options that we use frequently, such as non-linear background corrections for trace element analysis, and time-dependent intensity corrections for volatile elements or Na migration.

 

- Mapping

X-ray distribution maps we have been acquiring with the JEOL software. In future, as the newly developed Probe Image software continues to improve, we may switch.