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Analytical Chemistry > Spectroscopic Method > Flashcards

Spectroscopic Method Flashcards

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1
Q

Study of the interaction of electromagnetic radiation and matter.

A

Spectroscopy

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2
Q

Method when a photon is absorbed by an atom or molecule which undergoes transition from lower energy stateto higher energy state

A

Absorption spectroscopy

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3
Q

Occurs when an atom or molecule in an excited state returns to a lower energy state, and the excess energy is often released as photon

A

Emission spectroscopy

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4
Q

Emission following the absorption of a photon is called ____

A

Photoluminescence

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5
Q

Emission following a chemical reaction is called

A

Chemiluminescence

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6
Q

Choose the correct order of spectroscopic instrumentation.

A. Source, wavelength selector, sample container, detector, readout
B. Detector, source, wavelength selector, sample container, readout
C. Readout, detector, sample container, wavelength selector, source

A

A

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7
Q

Source of radiation in spectroscopic methods can either be ____ or _____ sources

A

Continuum kr line sources

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8
Q

Source of radiation in spectroscopic methods can either be ____ or _____ sources

A

Continuum or line sources

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9
Q

Lamp that emits radiation over a broad range of wavelengths, with a relatively smooth variation in intensity

A

Continuum sources

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10
Q

Lamp that emits radiation at selected wavelengths

A

Line sources

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11
Q

Highly useful line sirce because of their high intensities, narrow bandwidth, abd coherent nature of outputs

A

Laser (light amplification by stimulated emission of radiation)

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12
Q

Uses either absorption or constructive and destructive interference to control the range of selected wavelengths

A

Filter

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13
Q

Since filter can’t perform continuous selection of wavelengths,____ is used.

A

Monochromator

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14
Q

Sample container in spectroscopic methods that’s made of quartz, glass, and silica

A

Cuvette or cells

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15
Q

A device that identifies, records, or indicates a change in one of the variables in it’s environment

A

Detector

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16
Q

Converts various type of chemical and physical quantities into electrical signals

A

Transducers

17
Q

Transducers used for detecting UV/Vis radiation. About 10^6 to 10^7 electrons are produced at the anode for each photon that strikes it’s photocathode

A

Photomultiplier tube (PMT)

18
Q

Device that displays the signal from the transducer in a form that is easily interpreted.

A

Signal Processor

19
Q

Radiation from the instrument that is outside the the nominal wavelength band chosen for the determination

A

Stray light

20
Q

When a molecule absorbs EMR, the number of photons passing through the sample decreases. Measurement of this decrease is called

A

Absorbance

21
Q

Plot of absorbance as function of the photon’s energy is ____

A

Absorbance spectrum

22
Q

Ratio of the radiant power passing through a sample to that from the source

A

Transmittance

23
Q

More commonly used in expressing attenuation of radiation because it is a linear function of analytes concentration

A

Absorbance

24
Q

Simplest instrument in UV-VIS that uses a single optical path between source and detector

A

Filter photometer

25
Q

Instrument equipped with a fixed- wavelength monochromator

A

Single Beam spectrophotometer

26
Q

Instrument equipped with a scanning monochromator that allows for automated recording of spectra. More versatile than S-BS

A

Double beam spectrophotometer

27
Q

In this instrument, radiation passes through the sample and is dispersed by grating

A

Diode array spectrometer

28
Q

First step in all atomic spectroscopic procedures is _____, a process in which a sample is converted into gas-phase atoms or elementary ions

A

Atomization

29
Q

With this atomizer, samples are introduced in a steady, continuous stream.

A

Continuous atomizer

30
Q

With this atomizer, individual samples are injected by a syringe or autosampler

A

Discrete atomizer

31
Q

With this atomizer, individual samples are injected by a syringe or autosampler

A

Discrete atomizer

32
Q

Widely used for analysis of trace metals in a variety of sample matrices

A

Atomic Absorption Spectroscopy (flame)

33
Q

Ideally suited for a multi -elemental analysis because all analytes in a sample are excited simultaneously

A

Atomic emission spectroscopy

34
Q

Common light source for atomic measurements is __

A

Hollow cathode lamp
Anion- tungsten
Cation- Ne or Ar

35
Q

Hollow cathod lamp is a ___ lamp that permits determination of more than one element

A

Multi element

36
Q

AAS Instrumentation

A

Nebulization
Desolation
Volatilization
Dissociation
Ionization

37
Q

Differentiate AAS and AES

A

AAS
Flame
Furnace

AES
Plasma ES
ICP-MS

38
Q

Electrically conducting gaseous mixture present in AES containing significant concentration of cations and electrons

A

Plasma

Analytical Chemistry (16 decks)

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