Method and apparatus for thermalization of ions
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United States of America Patent
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Jun 12, 2012
Grant Date -
Oct 28, 2010
app pub date -
Jun 14, 2007
filing date -
Jun 16, 2006
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Abstract
A method of pulsing gas in a quadrupole ion trap to reduce excess internal energy of ions formed externally to the trap at high-vacuum conditions by laser desoprtion is disclosed. With pulsed gas introduction, pressures greater than those under which traps are normally operated can be achieved over a few milliseconds. Under these elevated pressure transients, the process of translational cooling is accelerated and ions undergo thermalized collisions before dissociation occurs. Minimization of uncontrolled fragmentation (thermalization) and enhanced sensitivity are observed at pressures exceeding a threshold of about 1 mTorr.
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