If you're familiar with ETD (electron transfer dissociation)
And the much newer and (magical - I still don't get how using large magnets forces more democratic fragmentation, but it's fast as heck, EAD (electron something that starts with an A dissociation)).
Here is something called ECD (electron Capture(?) dissociation).
Which was equipped here into an Agilent Triple quad wearing an extremely tall tophat.
Edit: I have been informed that is a Q-TOF.
This appears to allow top down proteomics of little proteins with ECD that is much faster than ETD! It still seems slower than EAD, but might be an attractive solution for upgrading an Agilent top hat in some labs?
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