Extra x-ray practice
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How many electrons are emitted by X-ray
- two electrons
- source electron
- Ejected electron
What does X-ray depend on
atom atomic number
How many spectra does X-ray produce?
- two major series type
- K series
- L series
Bohr Atomic Model Explains ...
- Spectra of Hydrogen
- Energy of atom is related to the distance of electron from nucleus
- energy of atom is quantized
atom can only have certain specific energy states called
Quantum levels or energy levels
X-ray analysis is ___________ for the sample and X-ray spectrum is _________ complex than optical sepctra
___________ determines wavelength used for anlaysis
what is theta?
Anlge between incident beam and the lattice planes
it is _________ that determines the identity of elements in a sample
Common metal used in X-ray
Which part of the x-ray source causes the emission
What is Collimeter
it is a series of metal plates with holes in the middle. it is designed to absorb all X-rays not traveling in the proper direction.
Why normal grating or prism can not be used
- X-ray would either pass through or be absorbed
- no dispersion
Disperser is a single crystal mounted on a rotatable table
The entire spectrum is disperesed simultaneously (T/F)
As the crystal rotates ______, th edetector is rotated _____ to keep the detector in line with the _____-
- Diffracted radiation
What is the difference between XRD and XRF?
In XRD the electron are bounced off while in XRF wavelength is being emitted
X-ray reads Carbon atom (T/F)
Ionization Detector Contains________-,__________,______, and Solid state Detector contains________,_________,and________
- Ionization chamber, proportion Counter, Geiger muller Tube
- Fluorescent Screen, Scintillation Counter,PMT detector
What gas is used in ionization detector
Ionization Detector does not discriminate between different radiation (T/F)
In the semiconductor Detector, the detection is base on ...
Based on the current required to re-establish the depletion zone
What is the difference between WD-XRF and ED XRF Analysis?
- WD-XRF has X-ray tube, Sample holder, Crystal, and detector. Wavelength is detected.
- Detector can detect up to 24 element simultaneously
- ED-XRF has only x-ray tube and sample holder. energy is being detected instead of wavelength.
- Detector is sequential or Simultanous
Which XRF analysis has greater resolution and better S/N ratio?
Typical limits of detection
X-ray can be scattered by the planes in a crystal, resulting in both __________ and _________ interference
- Constructive( results in diffraction)
Provides information on structure and chemical make up of materials
The repetitive patterns of the unit cell result in _________ that _______ x-rays
- Diffraction planes
Atoms located exactly on a crystal plane produce _______- diffraction
Atoms located halfway between planes produce ____________- interference
What is Bragg's Law of Diffraction?
- When an xray stikes a crystal, some of the xrays are scattered by the atoms at the surface
- others penetrate the second layer of atoms where more scattering occurs
- this scattering results in diffraction and will only occur if the distance between atom layers is approximately the same as the wavelength of the xray
A ____________ may be used instead of film to yield exact _____ data
- Scintillation Counter
Parallel beam optics generated through..
Where does Gobel mirror located
- Between Xray tube and sample
- it will result in parallel beams to hit the sample
what kind of informatin can be obtained from a powder diffration pattern?
- Peak Position ------------------- dimention of the unit cell
- Peak intensity-------------------- content of the unit cell
- Peak broadening----------------- Strain/crystallite size
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