Methods and systems for determining a measure of a rate of decay of an ion sample. Specifically, the present disclosure provides methods and apparatus for determining decay constants and cross-section measurements in parallel to mass measurement and decay time correction. The disclosure particularly relates to methods and apparatus for performing Fourier transform mass spectrometry (FTMS).

Methods and systems for determining a measure of a rate of decay of an ion sample. Specifically, the present disclosure provides methods and apparatus for determining decay constants and cross-section measurements in parallel to mass measurement and decay time correction. The disclosure particularly relates to methods and apparatus for performing Fourier transform mass spectrometry (FTMS).

A vacuum pressure gauge is described herein. One apparatus includes an ion trap configured to trap antimatter therein in a vacuum chamber, and a controller configured to determine a lifetime of the antimatter trapped in the ion trap and determine a pressure in the vacuum chamber based, at least in part, on the determined lifetime of the antimatter.

A vacuum pressure gauge is described herein. One apparatus includes an ion trap configured to trap antimatter therein in a vacuum chamber, and a controller configured to determine a lifetime of the antimatter trapped in the ion trap and determine a pressure in the vacuum chamber based, at least in part, on the determined lifetime of the antimatter.

A vacuum pressure gauge is described herein. One apparatus includes an ion trap configured to trap antimatter therein in a vacuum chamber, and a controller configured to determine a lifetime of the antimatter trapped in the ion trap and determine a pressure in the vacuum chamber based, at least in part, on the determined lifetime of the antimatter.

A vacuum pressure gauge is described herein. One apparatus includes an ion trap configured to trap antimatter therein in a vacuum chamber, and a controller configured to determine a lifetime of the antimatter trapped in the ion trap and determine a pressure in the vacuum chamber based, at least in part, on the determined lifetime of the antimatter.