Frequently Asked Questions（FAQ）

What are the QPMS advantages compared to the magnetic field type? 2. MS METHOD What are the QPMS advantages compared to the magnetic field type? The only GCMS work, that QP type cannot do but the magnetic field type can, is work using millimass (accu ...

Please explain the principles, advantages, and disadvantages of CI 1. BASIC MASS SPECTROMETRY Please explain the principles, advantages, and disadvantages of CI. CI (Chemical Ionization) First, a reagent gas is ionized by the fast electrons from the ...

Please explain the principles, advantages, and disadvantages of EI, CI, and NCI easily. 1. BASIC MASS SPECTROMETRY 06. Please explain the principles, advantages, and disadvantages of EI, CI, and NCI easily. Mass spectrometry requires that samples be ...

NCI: Why is the ion source changed between NCI and PCI? 3. ION SOURCE FOR NCI: Why is the ion source changed between NCI and PCI? With CI the ion source sensitivity is determined by the reagent gas pressure within the ionization chamber and the abili ...

Why are there decimal points in MS data? 1. BASIC MASS SPECTROMETRY Why are there decimal points in MS data? The mass numbers used in mass analysis are defined as follows. The mass number of the carbon 12 isotope, consisting of 6 protons and 6 neutro ...

Please explain the principles, advantages, and disadvantages of EI 1. BASIC MASS SPECTROMETRY Please explain the principles, advantages, and disadvantages of EI. EI (Electron Impact) EI is the fundamental ionization mode. When problems are encountere ...

What are the selection guidelines for reaction gases used with CI and NCI? 5. ANALYSIS 01. What are the selection guidelines for reaction gases used with CI and NCI? Reaction gases used with CI/NCI include methane, isobutane, and ammonia. The questio ...

What does m/z mean? 1. BASIC MASS SPECTROMETRY 01. What does m/z mean? M stands for mass and Z stands for charge number of ions. In mass analysis, an electron is taken from molecules to create single charged ions. If two electrons are removed, double ...

Please explain the principles, advantages, and disadvantages of NCI 1. BASIC MASS SPECTROMETRY Please explain the principles, advantages, and disadvantages of NCI. NCI (Negative Chemical Ionization) Both EI and CI measure positive ions (ions with ele ...

What are the measure­ment principles of MS? 1. BASIC MASS SPECTROMETRY Magnetic field Sector type Ions travel in a circular orbit within a magnet but the radius of the orbit is different depending on the ion mass. This difference is utilized to separ ...