MODULE 17

Question 1

analytical technique used in the analysis of solid, conducting materials.

Answer 1

Glow Discharge Atomic Emission Spectrometry

Question 2

Though primarily of interest as a depth
profiling technique on samples with
varying layers of both conducting and
non-conducting materials

Answer 2

Glow Discharge Atomic Emission Spectrometry

Question 3

it is also capable of rapid bulk analysis of homogenous, solid samples

Answer 3

Glow Discharge Atomic Emission Spectrometry

Question 4

technique in which the composition of elements in samples, mostly water-dissolved, can be determined using plasma and a spectrometer

Answer 4

Inductively coupled plasma

Question 5

This allows the analyst to not only
quantify the elemental composition of a
sample, but to evaluate it in terms of
homogeneity with depth

Answer 5

Glow Discharge Atomic Emission Spectrometry

Question 6

Emission spectrum generated by
bombardment of samples by argon ions in a

Answer 6

Sputtering process

Question 7

under the influence of a potential gradient these ions will impact on the surface of the cathode leading to vaporization and excitation of atoms from its surface

Answer 7

Sputtering

Question 8

what type of spectrometry is the faster, cheaper, and easy to perform than
GD-MS or SIMS

Answer 8

Glow Discharge Atomic Emission Spectrometry

Question 9

capable of providing information about the elemental and isotopic composition
of samples

Answer 9

SIMS (Secondary Ion Mass Spectrometry)

Question 10

its ability to accurately and rapidly
determine a depth profile of multiple
layers of varying composition on a
substrate

Answer 10

Glow Discharge Atomic Emission Spectrometry

Question 11

can be used for the analysis of
trace, minor and major constituents in
electrically conducting samples, especially metallurgical specimens

Answer 11

Glow Discharge Lamp

Question 12

It was also routinely used for the bulk
analysis of materials that are used in
nuclear and uranium enrichment
plants

Answer 12

Glow Discharge Atomic Emission Spectrometry

Question 13

type of emission spectrometry that uses
plasma to produce excited atoms and ions that emit electromagnetic radiation at wavelength

Answer 13

Plasma Emission Spectrometry

Question 14

In plasma emission spectrometry, the gas usually used is ___________ which is ionized by the influence of a strong electrical field either by a direct current or by radio frequency.

Answer 14

Argon

Question 15

two types of plasma sources are in
widespread use

Answer 15

De arc discharge and radio frequency

Question 16

Emission of electromagnetic radiation
in the visible and ultraviolet regions of the spectrum by atoms and ions after electronic excitation in a high temperature gas plasma

Answer 16

Plasma Emission Spectrometry

Question 17

Very widespread for qualitative and
quantitative analysis of metals and some non-metals, particularly at trace levels

Answer 17

Plasma Emission Spectrometry

Question 18

the potential for the employment of
plasma emission spectrometry is
enormous and it is finding use in almost
every field where ______________

Answer 18

Trace elements

Question 19

In a direct-current plasma source (DCP)
initial heating of an inert gas, usually
argon is produced by a ___________

Answer 19

dc - arc

Question 20

initial heating of an inert gas, usually
argon is produced by a dc-arc

Answer 20

Direct current plasma source

Question 21

A common version of the DCP uses an inverted ________________ with the excitation region established at the intersection of two argon streams.

Answer 21

V-shaped electrode assembly

Question 22

A ___________ is used to inject the sample
at this intersection point superior stability and sensitivity

Answer 22

Nebulizer

Question 23

A particular shortcoming of the dc source is the dependence of the signal on the surface of the ___________

Answer 23

carbon electrodes

Question 24

second plasma emission source which has become the most popular

Answer 24

Inductively Coupled Plasma Torch

Question 25

An ion source that consists of a torch that is surrounded by a ____________

Answer 25

radio frequency

Question 26

The sample solution is pumped by a peristaltic pump at a fixed rate and converted into an aerosol
by a _________________

Answer 26

Nebulizer

Question 27

Two related approaches to the dispersion and measurement of emitted radiation

Answer 27

Conventional Optics
Echelle Optics

Question 28

in order to carry out simultaneous
measurements on this type of instrument, each spectroscopic line will require a separate channel.

Answer 28

Conventional Optics

Question 29

conjunction with a two-dimensional array of radiation detectors.

Answer 29

Echelle optics

Question 30

employ a combination of prism and diffraction grating light dispersion at right angles in order to improve the resolution of the spectrum.

Answer 30

Echelle Optics System