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                                            Geology and Geophysics

Kline Geology Laboratory, P.O. Box 208109, New Haven, CT 06520-8109

small Yale shieldScintag Horizontal Theta/2-Theta GoniometerYale Geology and Geophysics

The Yale (Geology & Geophysics) X-Ray Diffraction Laboratory is being decommissioned. If a replacement instrument is planned in the future, a re-direct to a new page should show up here.


The current operating status of the X-Ray Diffractometer (currently DOWN and being decommissioned ) can be found by clicking here.

Information Contact, Jim Eckert Vendors of Equipment in our Lab:
Current XRD Status Scintag [defunct]
XRD Fundamentals (General) Omni Instruments (Control Hardware)
Current hourly usage rates TASI Technical Applications (Control and Processing Software)
Current Sample Holder/Stage Configuration 1998-2001 Software and Hardware Upgrades
Upcoming SCHEDULE, Yale-Geology XRD Calendar, click here
Internal Links on this Page: Links to Other XRD Information:
Yale Geology XRD Access; NOTE for New Users Page of Other XRD Resources

(If you are not generally familiar with XRD, you may wish to click here.)


The Yale University (Geology & Geophysics) XRD facility housed an automated Scintag PAD V diffractometer installed in 1988. This diffractometer included a two-circle (2-theta, omega) goniometer, Cu target X-Ray tube, and a liquid-nitrogen cooled germanium semiconductor detector. This type of detector enhances signal to noise ratios over those obtained with the standard scintillation detectors. Additional hardware available included a transmission pole-figure (azimuth scan) sample holder. Jim Eckert is the contact point to answer questions and assist users with all forms of analysis. However, please note that the lab schedules often preclude an especially rapid reply; we appreciate your patience.

Acquisition software, an upgrade of which we completed in 2001, provided the ability to perform step scans (for high precision), transmission pole figures and azimuth scans (both for preferred orientation analysis). Scans were highly customizable, either coupled or with independent control of each individual axis (3 circles). Up to 16 individual zones can be programmed in a single acquisition.

The available data-processing software included routines to find and fit peaks, remove background, determine integrated peak areas, display and compare spectra graphically, and search the PDF database for matching patterns.


Instrument upgrades installed from 1998-2001 include motor and automation control hardware of Omni Instruments and the associated, Windows-based, acquisition/processing software of Tasker Applications. All these components of the instrument upgrade were supported graciously by NSF grant EAR-9810089 and Yale University.


Information on current hourly rates is available here.  We encourage use by both academic and commercial institutions, to make optimal use of the facility. For the Upcoming Schedule, Yale-Geology XRD Calendar, click here

NOTE for New Users: The Radiation Safety Section of OEHS requires that all new XRD users read a manual section on XRD-safety procedures and, along with their advisor, sign a statement indicating they have read and understood the material. Ideally this should precede the start of XRD training. The manual section is available on the OEHS website. The required forms are available in the lab. The training process we employ is rather direct, comprised initially of proceeding through all steps while you observe, then in the next subsequent session you proceeding through all steps while we observe that you are observing all the relevant procedures and protocols.

Other XRD Resources

A page listing a few other XRD resources and useful links can be found by clicking here.


Please send any comments, questions, or scheduling requests to Jim Eckert. However, please note that the lab schedules often preclude an especially rapid reply and that the electron-microprobe schedule typically constrains availability for consulting, training, scheduling, etc. We appreciate your patience and understanding. Thank you.

Laboratory Manager, Electron Microprobe and XRD Facilities
Office: KGL 327 Voice: 203-432-3181
Alt.#1 (@probe) 436-9182 Alt.#2 (@XRD) 432-5169 FAX: 203-432-3134
XRD Lab: (203) 432-5169

Emailemail: Jim Eckert

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