Important Questions

Question 1

X ray generates by bombarding heavy metal target with high energy ……..

Answer 1

Electrons

Question 2

Tangustin produce ……….energy than silver

Answer 2

High

Question 3

Monochromayion by ………of a set of …….si crystals

Answer 3

Diffraction, parallel

Question 4

Diffraction grating according to……….law

Answer 4

Bragg’s law

Question 5

True or false?
Higher order reflection n>1 are
rejected by making the crystals parallel

Answer 5

False

Question 6

Beer lambart law

Answer 6

It=l ex(-M.x)

Question 7

M/p is called mass absorption coefficient

Answer 7

True

Question 8

X-ray absorption spectrum represent by

Answer 8

Energy dependent , absorption coefficient

Question 9

XANES depend strongly on

Answer 9

Chemical bonding

Question 10

EXAFS is caused by interference of scattering photoelectron on atom surrounding ?

Answer 10

True

Question 11

XANES gives information about.. …..

Answer 11

Valence, coordination number

Question 12

EXAFS give information about…….

Answer 12

Number, type, distance of ligand atoms

Question 13

EXAFS,EANES together contrust spectroscopy effective model of metal ?

Answer 13

True

Question 14

XAS is applicable to any element?

Answer 14

True

Question 15

The quantum yield equal…..

Answer 15

No.of emitted electrons/No.photons in primary beam

Question 16

XPs uses …..X-ray ay range of ……

Answer 16

Soft , 100-2000ev

Question 17

The energy depends on …..

,……

Answer 17

Atomic number, chemical bonding

Question 18

XAS used to determine the energy spacing between vibrational levels.

Answer 18

False , XPS

Question 19

PES spectrum is obtained of ……

Answer 19

Photo electrons count intensity versus binding energy

Question 20

PES spectrum PEAKS refers to …….

Answer 20

Different binding energy

Question 21

INTENSITY OF PEACKS refers to….

Answer 21

Number of electrons in the subshell

Question 22

Spin orbital splitting and peack area ratios assit in element identification?

Answer 22

True

Question 23

Spin orbital splitting and peack areas ratios different for an element?

Answer 23

False, the same

Question 24

PES allow obtain information about the nature of existing states and non radioactive ehiyis called…..

Answer 24

Augers effect

Question 25

لمدا refers to in elastic mean free path of an election in a solid

Answer 25

True

Question 26

In elastic mean free path depends on ......

Answer 26

KE

Question 27

XES is a spontaneous emissions of x-ray photons in a........ transition between two electrons state whe core level is .....

Answer 27

Dipole,filled

Question 28

XES investigate the products of relaxation?

Answer 28

True

Question 29

XES depend on the primary photon energy?!!

Answer 29

False , no depend

Question 30

In resonance emission the primary radiation energy is far from ionization threshold?

Answer 30

False , near

Question 31

The resonance x-ray emission often called resonance inelastic x-ray scattering?!!

Answer 31

True

Question 32

RIXS very useful tool for:

Answer 32

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.

Question 33

X-ray reflection spectroscopy is defined by .......,....

Answer 33

Photo absorption, polarizability

Question 34

The interaction of ........ with sample leads to polarization of the substance

Answer 34

Photon

Question 35

X-ray reflection spectroscopy is uses to study the strong gravity region black holes .

Answer 35

True

Question 36

Test Einstein theory of general relativity determined by

Answer 36

X-ray reflection spectroscopy