High pressure trapping in Fourier transform mass spectrometry: A radiofrequency-only-mode event.
A new event for the Fourier transform mass spectrometry (FTMS) sequence is developed and demonstrated. During this event, called a radiofrequency (RF)-only mode event, the typical passive cubic trap of a Fourier transform mass spectrometer is made to operate as an active quadrupole ion trap. The transition between active and passive modes is developed so that ion loss as a consequence of the transition can be held to 15% or less. The adduct of the ion-molecule reaction of the 1,3-butadiene radical cation and methyl vinyl ether was detected during the Rf-only-mode event at a helium pressure of ∼1×10(-3) torr even though this adduct is not detectable under standard FTMS operating conditions.
Midwest Center for Mass Spectrometry, Department of Chemistry, University of Nebraska, 68588-0304, Lincoln, NE.
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Rempel
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Gross