| 摘要 |
<p>In the type of ion mobility spectrometer having a unidirectional drift and source flow (30) which is exhausted (22) downstream of an ionisation source (10), improved sensitivity is obtained by entraining the effluent (18) from a gas chromatograph within a faster moving further gas flow (32), both being introduced in a direction counter to that of the said unidirectional flow.</p> |
