【求助】关于安捷伦气相的几个疑问

你的问题是气质联用仪器的，给你转到相应的版面。

应助达人

高能打拿极（HED）吸引四级杆有的正离子，但离子束打在HED上，就发射电子，电子倍增管吸引电子，而被检测到。

应助达人

高能打拿极参考：

应助达人

高能打拿极（HED）参考英文：
The HED/EM is current technology and is used in the 5973 and 5975. The high
energy dynode (HED) attracts the positively charged ions exiting the quadrupole.
When the ion beam hits the HED, electrons are emitted. The electrons are
attracted to the electron multiplier. The incoming electrons hit the inside surface
of the electron multiplier’s horn liberating more electrons from the surface. These
electrons cascade down the horn, ejecting more electrons with every impact.
Electrons produced by the HED cause the EM voltage to be lower (longer EM
life) when compared to the X-Ray/Electron Multiplier style systems.
Electrons, instead of ions, striking the EM do not remove as much of the EM
working surface (longer EM life) when compared to the X-Ray/Electron
Multiplier style systems.
Mid mass response (m/z 219) is greatly increased when compared to the XRay/
Electron Multiplier style systems.
For increased signal, increase the electron multiplier gain. For highly concentrated
samples, decrease the electron multiplier gain
MS Basics and Hardware Configuration
High Energy Dynode/Electron Multiplier Detector
22
Be aware that the electron multiplier behaves as though it has a finite supply of
electrons. You may operate the electron multiplier at high sensitivity for a
relatively short duration. Alternatively, you may use the same electron multiplier
at a lower voltage value for a much longer time

麻烦您将其他的两个问题也给做个解答，谢谢哈。

阳极吹扫是防止ECD检测器污染的