High-resolution mass spectrometry involves the use of a detector that can measure m/z values to at least ______ decimal places. 2 4 6 3
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3. Molecular Mass Spectrometry a. What resolution would be necessary in order to resolve peaks from univalent ions having molar masses of 1,058.0 g/mol and 1,058.5 g/mol? b. A certain MS uses a magnetic sector mass analyzer having a fixed accelerating voltage of 2.95 kV and a radius of 0.233 m. What magnetic field (in T) must be used to focus a carbon dioxide ion [CO2+] on the detector? c. Determine the time of flight for an 800 m/z ion accelerated across 6.5 kV and allowed to drift through a length of 2 m. d. Naphthalene, a polyaromatic hydrocarbon (C10H8), was analyzed by MS using chemical ionization and a quadrupole mass analyzer. The base peak occurred at m/z = 129, and the largest ion mass in the spectrum was seen at m/z = 156. Explain these observations. e. Consider the molecules X below (molecule X = A-B-B-C) as analyzed by MS. The molecule can be described as a system with three possible fragments: fragment A has a molecular mass of 10 amu, fragment B has a mass of 15 amu, and fragment C has a mass of 20 amu. Assume that (1) the charges generated on the fragments are either +1 and only one bond is cleaved for each fragmentation. List all possible ions that could be generated, and determine if each could be distinguished explicitly and if any ion would have m/z similar to other ions. f. What would be the velocity of a single methyl ion (CH3+) if it were accelerated across a voltage of 5.0 x 10^2 volts. g. What voltage would be needed to accelerate a tert-butyl dication (C4H9^2+) to a velocity of 1.0 x 10^6 m/s? h. Calculate the resolution to resolve peaks for CH2N (M = 28.0187) and N2+ (M = 28.0061) i. Calculate the ratio of (M+2) to M+ peak height for C10H6Br2.
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Two peaks near m/z 31.00 differ in mass by 0.010 Da, and the trough between them is roughly 10% of the peak height. Estimate the resolving power of the spectrometer from the expression [m/z]/[delta m/z].
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