Fusion Message Board

In this space, visitors are invited to post any comments, questions, or skeptical observations about Philo T. Farnsworth's contributions to the field of Nuclear Fusion research.

Subject: Re: clarification (Mass spec)
Date: Aug 16, 1:30 am
Poster: DaveCooper

On Aug 16, 1:30 am, DaveCooper wrote:

>The surface of the RAM will already be passivated with SiO2 or SiN. This probably will pose no real obstacle to fast particles.
>The problem actually is that the particles will need to be quite slow - a few eV in energy. This is necessary for mass filtering to occur in a quadrupole MS. At higher velocities, the ions travel so rapidly there is no mass filtering by the quadrupole electric field.

Might not be as big a problem for a magnetic sector instrument. The speed would affect the calibration, and resolution.

Not sure what energy would penetrate the passivation layer.
>>Dave C.