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Natural Science Forum / Physics / General Physics / July 2008Electron microscope sees single hydrogen atoms
Electron microscope sees single hydrogen atoms http://physicsworld.com/cws/article/news/35034 Physicists in the US claim to have used a transmission electron microscope (TEM) to see a single hydrogen atom – the first time that a TEM has been used to image such a light atom. The breakthrough was made by supporting the atom on graphene — a sheet of carbon just one atom thick. The team has also been able to watch hydrocarbon chains move across the graphene surface, suggesting that the technique could be used to study the dynamics of biological molecules. See: http://physicsworld.com/cws/article/news/35034 > Electron microscope sees single hydrogen atoms > http://physicsworld.com/cws/article/news/35034 [quoted text clipped - 9 lines] > > See:http://physicsworld.com/cws/article/news/35034 Sam, I am a little hesitant to accept this, because the energy required to shorten the wavelength of an electron to the level where it could be possile to image a hydrogen atom is far greater than the energy level required to disrupt the hydrogen atom. I'm also a bit hesitant to accept any information as fact that is posted on a commercial website on which you have to sign in to read. Harry C. >> Electron microscope sees single hydrogen atoms >> http://physicsworld.com/cws/article/news/35034 [quoted text clipped - 19 lines] > > Harry C. As you should be, Harry. I wish all of the "science" article were accompanied by reference to pre-prints or journal articles... But few are... for what it's worth.. I do try to filter somewhat. A poor filter, but still an attempt. -Sam > hhc...@yahoo.com wrote: > >> Electron microscope sees single hydrogen atoms [quoted text clipped - 29 lines] > > - Show quoted text - Sam, I hope my comments were not taken as any disrespect to you. You're about the only poster that still posts here regularly in an effort to elevate the level of discussions on this newsgroup. Here I simply posted certain facts that I certainly believe does not come as news to you. I tend to believe that both of us are here trying to elevate the level of ongoing discussion, both in our own ways. Harry C. >> hhc...@yahoo.com wrote: >>>> Electron microscope sees single hydrogen atoms [quoted text clipped - 34 lines] > > Harry C. Yes--we consciously do (and at least a half dozen others) attempt to raise the discussion level. I sincerely thank you, Harry, and the others who really do contribute! I came here some years ago expecting to learn... as opposed to "teach". :-( >> Electron microscope sees single hydrogen atoms >> http://physicsworld.com/cws/article/news/35034 [quoted text clipped - 19 lines] > > Harry C. They had a link to the original Nature article http://www.nature.com/nature/journal/v454/n7202/abs/nature07094.html which said: -> We emphasize that we do not claim to have resolved a hydrogen–carbon -> distance, which would require advanced aberration-corrected -> instrumentation. However, detecting an isolated hydrogen atom against a -> nearly invisible background only requires an adequate signal-to-noise -> ratio.  SignatureJim E. Black (domain in headers) How to filter out stupid arguments in 40tude Dialog: !markread,ignore From "Name" +"<email address>" [X] Watch/Ignore works on subthreads > Electron microscope sees single hydrogen atoms > http://physicsworld.com/cws/article/news/35034 [quoted text clipped - 9 lines] > > See:http://physicsworld.com/cws/article/news/35034 To be isolated in such a structure, a hydrogen atom needs to be rigidly covalently bound to one of the molecules of the structure or else it would not say put as the scattering occurs. So all that remains to possibly be detected is the hydrogen nucleus (a proton) hanging out. This means that if "something" was really detected in the process pertaining to a hydrogen atom, it had to be the hydrogen nucleus. André Michaud |
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