Question

For a time-of-flight (TOF) mass analyzer that is 1.0 m long

a) what would be the flight time for an ion with a m/z ratio of 58 if the accelerating voltage used was 3000 V?

b) what would be the flight time for an ion with a m/z ratio of 57 if the accelerating voltage used was 3000 V?

Answer 1

Time-of-flight (TOF) mass analyzer will be calcualte as follows:

T_f =L (m/z)^1/2(1/2V)^1/2

Here L = length of tube ; 1.0 m

V= Voltage from the ion source

a) what would be the flight time for an ion with a m/z ratio of 58 if the accelerating voltage used was 3000 V?

T_f =1.0 (58)^1/2(1/2*3000)^1/2

T_f =1.0*7.612*0.0129

T_f =0.098 s

b) what would be the flight time for an ion with a m/z ratio of 57 if the accelerating voltage used was 3000 V?

T_f =L (m/z)^1/2(1/2V)

T_f =1.0 (57)^1/2(1/2*3000)^1/2

T_f =1.0*7.55*0.0129

T_f =0.097 s