{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lect13_notes

Info icon This preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
X-Ray Diffraction, Scanning Electron Microscopy and Microanalysis Lecture 13 Prof. Daniel R. Mumm Chemical Engineering and Materials Science Henry Samueli School of Engineering University of California, Irvine [email protected] University of California, Irvine CBEMS164, Fall 2013 CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 2 White (Bremsstrahlung) Radiation – Stochastic Deceleration
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 3 Intensity of White Radiation CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 4 Generating X-rays - Characteristic
Image of page 2
CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 5 Characteristic Transitions and Nomenclature CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 6 Characteristic Transitions and Nomenclature K - Electron from L shell fills hole in K shell K - Electron from M shell fills hole in K shell L - Electron from M shell fills hole in L shell L - Electron from N shell fills hole in L shell EDS is typically concerned with K, L, and M lines - and lines are generally called the KLM lines Note: Cannot excite peak with more energy than incident electron beam
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 7 Characteristic Transitions and Nomenclature CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 8 Relative Weighting of Signals in Spectra
Image of page 4
CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 9 Characteristic X-Ray Peak Energies CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 10 Relative Weighting of Signals in Spectra
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 11 Sample EDS Spectrum – Copper CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 12 Hardware Utilized in Energy Dispersive Spectroscopy (EDS) Analysis
Image of page 6
CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 13 Hardware Utilized in Energy Dispersive Spectroscopy (EDS) Analysis Silicon Drift Detector – SDD Faster acquisition rate No LN 2 required Li-drifted Si detector – Si(Li) Needs LN 2 cooling CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 14 SDD Systems The Silicon Drift Detector (SDD) is an energy dispersive X-ray). The detector crystal is moderately cooled by vibration free thermo-electric coolers; any generated heat is dissipated by passive convection without the need for additional cooling. A monolithically integrated on-chip FET acts as a signal amplifier and supports improved energy resolution. The sideward depletion of the active detector volume in connection with the integrated drift structure provides an extremely small detector capacitance that enables the use of fast signal processing techniques. The pulse throughput of SDDs is higher than that of e.g. Si(Li) by more than an order of magnitude. A super thin radiation entrance window separates the sensitive detector area from the ambient atmosphere and guarantees a good transmission for the X-rays of interest.
Image of page 7

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 15 X-ray Wavelength as ƒ(E) In describing x-rays, we make use of both the energy of the x-ray E(keV) and its associated wavelength (nm), which are related by the
Image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern