Important Questions Flashcards
X ray generates by bombarding heavy metal target with high energy β¦β¦..
Electrons
Tangustin produce β¦β¦β¦.energy than silver
High
Monochromayion by β¦β¦β¦of a set of β¦β¦.si crystals
Diffraction, parallel
Diffraction grating according toβ¦β¦β¦.law
Braggβs law
True or false?
Higher order reflection n>1 are
rejected by making the crystals parallel
False
Beer lambart law
It=l ex(-M.x)
M/p is called mass absorption coefficient
True
X-ray absorption spectrum represent by
Energy dependent , absorption coefficient
XANES depend strongly on
Chemical bonding
EXAFS is caused by interference of scattering photoelectron on atom surrounding ?
True
XANES gives information about.. β¦..
Valence, coordination number
EXAFS give information aboutβ¦β¦.
Number, type, distance of ligand atoms
EXAFS,EANES together contrust spectroscopy effective model of metal ?
True
XAS is applicable to any element?
True
The quantum yield equalβ¦..
No.of emitted electrons/No.photons in primary beam
XPs uses β¦..X-ray ay range of β¦β¦
Soft , 100-2000ev
The energy depends on β¦..
,β¦β¦
Atomic number, chemical bonding
XAS used to determine the energy spacing between vibrational levels.
False , XPS
PES spectrum is obtained of β¦β¦
Photo electrons count intensity versus binding energy
PES spectrum PEAKS refers to β¦β¦.
Different binding energy
INTENSITY OF PEACKS refers toβ¦.
Number of electrons in the subshell
Spin orbital splitting and peack area ratios assit in element identification?
True
Spin orbital splitting and peack areas ratios different for an element?
False, the same
PES allow obtain information about the nature of existing states and non radioactive ehiyis calledβ¦..
Augers effect
ΩΩ Ψ―Ψ§ refers to in elastic mean free path of an election in a solid
True
In elastic mean free path depends on β¦β¦
KE
XES is a spontaneous emissions of x-ray photons in aβ¦β¦.. transition between two electrons state whe core level is β¦..
Dipole,filled
XES investigate the products of relaxation?
True
XES depend on the primary photon energy?!!
False , no depend
In resonance emission the primary radiation energy is far from ionization threshold?
False , near
The resonance x-ray emission often called resonance inelastic x-ray scattering?!!
True
RIXS very useful tool for:
1- the investigation of magnetic dichroism
2-the selective exitation of inequivalent atom in compound
3- the band disperyion in crystals
4-the electronic structure of half metallic system.
X-ray reflection spectroscopy is defined by β¦β¦.,β¦.
Photo absorption, polarizability
The interaction of β¦β¦.. with sample leads to polarization of the substance
Photon
X-ray reflection spectroscopy is uses to study the strong gravity region black holes .
True
Test Einstein theory of general relativity determined by
X-ray reflection spectroscopy
