I'm quite sure mass spectrometer can't really separate the elements, it just enables an easier way to detect individual elements in a mix of many.
If mass spectrometer is able to makes the difference between 2 different Isotope (ex C14 and C12, or C12 and O16), that's because it use magnetics force to intefere on Isotopes movements, and then these can be detected by differentd ... detectors ^^. You'll say, but 2 different Isotope from 1 Atom can't be differently deviated by magnetic forces, because it's the same number of protons! You would be partialy right. In fact, mass is enough to distinguish 2 Isotope, as C12 and C14, from the same Atom.
Of course it already takes energy IRL, for a few Atoms ... what would it cost for Tons of materials ? Giga EU 
It would be a nice option but at least I have spent my entire coal supply to make diamonds. A stack of coal = 1 diamond
I find it useless. Use more carbon plate!
Advanced Generator uses a lot of it ^^. Seriously, do you really think 64 Coal worth 1 diamond ? I've already too much diamond (and also Coal, but ... ^^)
Hey Greg, I've a suggestion for you, before you add any space dimension: I would like to see FINITE dimensions that could be generated multiple times (deleting the old one) when you decide it. That would be HUGE Stronghold/Dungeons/others structures with new materials, more probability of ore spawning etc ...
Why, How ? By using a Highly-advanced machine, containing VERY advanced OV Scanner, wich would be able to detect weak point of the Terrestrial Crust, in order to send you into little hole in Earth (because oviously, if you're speaking about Minecraft's world, it wouldn't be interesting to go into ... the Void ^^) at the cost of very high energy (about 100 000 000 EU). Once your in, the only way you would have to go out would be to find a Higly-valuable-Energy-Ore (it would exist min 1 per dimension generated, 2 if you're very lucky, 3 if you're God [I mean Greg, because God does not exist]) to gain these 100 000 000 EU (except if you comes with a Nuclear Reactor and Ura ^^). This machine would also have a Large-Chest function, to make able to come back with a lot of Ore.
What would be the point of it ?
1- Making mining useful while you've already 4 Quarry.
2- Adding a new step to get better technologies (new Ore ?).
3- As it would be a giant Dungeon, it would be fun to explore
(creepers could as an example all be charged, there could be new powerful mobs, except I know you Greg have currently a poor knowledge of Entities
(compared to the rest), but in the same time very hard (What do you think of a limited amount of Genetically Modifyed Zombies because of Thorium/Ura Radiation ? 
4- It could contain a more-rich-in-Iron Lava (because you'd be close the the Earth Nucleus).
5- It would be a solution for respawning Ore once you've a world (I love your addon, but ... one of its problem is the Ore Generation, wich changed everyother week ^^), or once you've digged so far that you don't want to generate any new chunk ...
6- New machines --> More consumed materials--> More hours to spend playing! 