You set the strength of the magnetic field in both the steering region and velocity selector to B = 85.9 mT, and you set the strength of the electric field between the plates of the velocity selector to E = 7023 V/m. Then you adjusted the distance to the detector and found that it needed to be exactly 39.5 cm to the right of the velocity selector exit aperture in order to collect the ions that you were trying to identify. Write a symbolic expression for the charge-to-mass ratio of the collected ions in terms of B, E, and r (ONLY) then calculate its numeric value. Don't use v! E || = 240957 x C/kg
You set the strength of the magnetic field in both the steering region and velocity selector to B = 85.9 mT, and you set the strength of the electric field between the plates of the velocity selector to E = 7023 V/m. Then you adjusted the distance to the detector and found that it needed to be exactly 39.5 cm to the right of the velocity selector exit aperture in order to collect the ions that you were trying to identify. Write a symbolic expression for the charge-to-mass ratio of the collected ions in terms of B, E, and r (ONLY) then calculate its numeric value. Don't use v! E || = 240957 x C/kg
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Transcribed Image Text:Mass spectrometers like the one in the figure are ingenious
devices that use electric and magnetic fields to separate and/or
identify ions based on their specific charge-to-mass ratio, q/m.
Steering Region. The magnetic force exerted on the ions is
centripetal so move along a circle. The radius of a given ion's
circular path is directly proportional to its charge-to-mass ratio.
Velocity Selector. In order to reach the steering region, the
ions have to pass through the crossed E and B fields between
the plates of the velocity selector -- without being deflected.
The last bit of the puzzle is the detector. In order for the ions to
enter the detector, it must be located one diameter to the right
of the point where the ions entered the steering region.
Write a symbolic expression for the charge-to-mass ratio of the collected ions
in terms of B, E, and r (ONLY) then calculate its numeric value. Don't use v!
어트
||
= 240957
STEERING
REGION
x C/kg
•·
●
Ion Trajectory
Charged
Plates
+
+
+
You set the strength of the magnetic field in both the steering region and velocity selector to B = 85.9 mT,
and you set the strength of the electric field between the plates of the velocity selector to E = 7023 V/m.
Then you adjusted the distance to the detector and found that it needed to be exactly 39.5 cm to the
right of the velocity selector exit aperture in order to collect the ions that you were trying to identify.
+
+
+
B
lon
Detector
VELOCITY
SELECTOR
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