Atomic structure- mass spectrum

Question 1

why is it necessary to ionize the mixture

Answer 1

acceleration and detection

Question 2

how are ions accelerated

Answer 2

the positive ions accelerate toward the negatively charged plate

Question 3

who do the different ions separate in the flight tube

Answer 3

same kinetic energy, different velocities, heavier particles travel slower, lighter particles travel faster

Question 4

why is the inside of the machine a vacuum

Answer 4

so other particles cant interfere with the ion beam made from the sample

Question 5

how are the ions detected and how is their abundance measure

Answer 5

ions hit the detector and gain an electron this generates a current proportional to abundance

Question 6

name the ionization method when a particle gains a proton to form an ion

Answer 6

electrospray

Question 7

what are the two measurement made by the mass spectrometer

Answer 7

M/Z ratio and relative abundance

Question 8

why would a fluoride ion not be detected

Answer 8

because it has a negative charge

Question 9

how are ions formed

Answer 9

by electrospray or electron impact

Question 10

how are ions from via electron impact ionization

Answer 10

sample is vaporized
high energy are fired at sample
from an electron gun
one electron is knocked off each particle

Question 11

how are ions from via electrospray ionization

Answer 11

same is dissolved in a volatile solvent
sample is injected thought a needled at high voltage
sample is ionized by gaining proton

Question 12

which of the ionization method knocks off an electron to form an ion

Answer 12

electron impact

Question 13

all particles have the same kinetic energy how are they separated the the flight tube

Answer 13

different velocities
heavier particles travel slower, lighter particles travel faster

Question 14

when the ion hits the detector how is the current generated

Answer 14

ions hit the detector and gain an electron this generates a current proportional to abundance

Question 15

name the method of ionization

Answer 15

electrospray
electron impact

Question 16

a sample is injected through a needle at high voltage in which ionisation method

Answer 16

electrospray

Question 17

which ionization method uses an electron gun

Answer 17

electron impact

Question 18

a mass spectrum shows the measurement of M/Z ratio and relative abundance which axis represents M/Z ratio

Answer 18

X axis

Question 19

what is the purpose of the negatively charged plate

Answer 19

to accelerate the ions