Mass Spectroscopy Flashcards

1
Q

The energy of the electrons is

A

1600 kcal (70 eV)

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2
Q

The tallest peak in the mass spectrum is called the

A

base peak

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3
Q

Structure of MS

A

Inlet system

ion source

mass analyzer

detector

signal processor

Readout

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4
Q

The two main forms of MS are

A

electrospray

MALDI

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5
Q

Bromine (m+2) peak will be

A

50/50

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6
Q

Nitrogen will have

A

an odd number for MW (if odd # N)

an even number for MW (if even # N)

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7
Q

If the (m+2) peak is 1/3 as large as the M+ peak then you have

A

Cl

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8
Q

Loss of methyl equals

A

M+ - 15

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9
Q

Loss of ethyl

A

M+ - 29

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10
Q

Loss of propyl

A

M+ - 43

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11
Q

Loss of butyl

A

M+ - 57

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12
Q

Aromatics have a peak at

A

77

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13
Q

What is Raman spectroscopy?

A

small fraction of radiation scattered by certain molecules

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14
Q

What is Stokes?

A

emission energy is less than excitation energy

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15
Q

What is Anti-Stokes?

A

emission energy is more than excitation energy

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16
Q

The instrumentation for Raman

A

laser source

sample

wavelength selector

radiation transducer

data system

17
Q

Symmetric stretching is

A

Raman inactive

18
Q

Antisymmetric stretching is

A

Raman active

19
Q

To be Raman active there must be

A

a change in polarizability