Column Choice Suggestion

Start your search here: GC Column Selector | Agilent

The permanent gases are often separated on a PLOT column like 19091P-QO4 | Agilent ... That column is 30m x 0.32mmid, though. WIth the optimal MS Ion Source column flow of around 1.2 ml/min, the inlet pressure with that column going to the vacuum of a mass spectrometers is too low for good GC inlet pressure control.  The inlet pressure should always be >5 psi. ( see GC Calculators and Method Translator Software | Agilent ) . 

There are a couple of ways to make this work, though. Connecting a 30m and a 15m column together to make 45 m total is one simple way.

Also see: 

https://www.agilent.com/cs/library/applications/A01339.pdf

https://www.agilent.com/cs/library/applications/A00755.pdf

and more...