3A233Mass spectrometers, other than those specified in 0B002.g., capable of measuring ions of 230 u or greater and having a resolution of better than 2 parts in 230, as follows, and ion sources therefor:

a. Inductively coupled plasma mass spectrometers (ICP/MS);
b. Glow discharge mass spectrometers (GDMS);
c. Thermal ionisation mass spectrometers (TIMS);
d. Electron bombardment mass spectrometers having both of the following features:
1. A molecular beam inlet system that injects a collimated beam of analyte molecules into a region of the ion source where the molecules are ionised by an electron beam; and
2. One or more 'cold traps' that can be cooled to a temperature of 193 K (-80 °C);
e. Not used;
f. Mass spectrometers equipped with a microfluorination ion source designed for actinides or actinide fluorides.
Technical Notes:
1. Electron bombardment mass spectrometers in 3A233.d. are also known as electron impact mass spectrometers or electron ionisation mass spectrometers.
2. In 3A233.d.2., a 'cold trap' is a device that traps gas molecules by condensing or freezing them on cold surfaces. For the purposes of 3A233.d.2., a closed-loop gaseous helium cryogenic vacuum pump is not a 'cold trap'.