Assuming the length of drift tube in ToF MS is 2.3 m and accelerating voltage is 30,000 V, one type of ions can reach the ion collector in 11.3 µs. What is the molar mass of the ions, assuming the ions are singly charged cations?
Another instrumental analysis problem, please help!
The equation to find the mass(m) of a single ion is given by:
where:
q - charge on ion = 1.6*10^(-19) C
V - voltage = 30,000 V
t - time taken = 11.3 µs = 11.3*10^(-6) s
l - length of drift tube = 2.3 m
Substituting the values, we get
This is the mass of one ion. The molar mass is :
Hence the molar mass of ion is 140 g/mol
Assuming the length of drift tube in ToF MS is 2.3 m and accelerating voltage is...
An acceleration voltage of 30.0 kV is used to accelerate ions into the 1.54 m flight tube of a time‑of‑flight (TOF) mass spectrometer. The frequency at which spectra can be recorded is dependent on how long it takes the slowest ion to travel from the source to the detector. If you wish to scan up to ?/?m/z 6801 at what frequency (spectra/s) could spectra be recorded if a new spectrum begins each time the slowest ion reaches the detector? frequency:................spectra/s