Increasing the length of the rods in a quadrupole mass analyser (A) increases th
ID: 527203 • Letter: I
Question
Increasing the length of the rods in a quadrupole mass analyser (A) increases the resolution of the analyzer. (B) increases the sensitivity of the analyzer. (C) extends the mass range into the kilodalton ion masses. (D) increases the intensity of the magnetic field used for separating the ions. An ion injected into the quadrupole array of a quadrupole mass analyzer successfully passes through the analyzer based upon which fundamental parameter? (A) the V_de/V_rf ratio (B) the rod diameter (C) the maximum scan rate (D) the kinetic energy of the ion itself In MALDI mass spectrometry, the matrix helps with all of the processes except (A) ionizing the analyte. (B) absorbing laser light. (C) desorbing the analyte. (D) fragmenting the analyte. Which is most important in an FT mass spectrometer? (A) a long drift tube (B) a stable magnetic field (C) a Michelson interferometer (D) an electron multiplier with high gain To minimize the uncertainty in the measured concentration of an unknown using a visible spectrometer, the analyst should (A) employ a wavelength exhibiting high absorptivity. (B) select a wavelength where only the analyte responds. (C) adjust the absorbance of the unknown so that it is close to the mean of the absorbances of the standards used to develop the calibration curve. (D) all of the above.Explanation / Answer
11) answer is D-increases the intensity of the magnetic field used for separating the ions
12) answer is D-the kinetic energy of the ion itself
13) answer is D-fragmenting the analyse
14) answer is D-an electron multiplier with high gain
15) answer is D - all the above