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![]() | The contents of the Electron spin resonance page were merged into Electron paramagnetic resonance. For the contribution history and old versions of the redirected page, please see its history; for the discussion at that location, see its talk page. |
I moved this talk page, and the article's contents, to Electron Paramagnetic Resonance because essentially everything on the page referred to EPR, not ESR. - Astrochemist 19:10, 25 May 2007 (UTC)
Surely EPR and ESR are just different terms for exactly the same thing? 130.88.80.227 ( talk) 13:06, 9 January 2012 (UTC)
Equation cannot be read in the text. Please modify the format so that it appears correctly. —Preceding unsigned comment added by 220.227.97.99 ( talk) 14:11, 22 January 2010 (UTC)
I moved some of the introductory material to sections further down in the article. This allows the reader to see the contents box more easily. - Astrochemist 03:37, 10 May 2007 (UTC)
I removed the following:
I deleted the above sentence as I could not readily see how raising a spectrometer's frequency would cause the upper energy state to be more populated. It seems that just the opposite would be true. Am I missing something? - Astrochemist 04:43, 22 May 2007 (UTC)
Do we need an animated gif in the final section? How about a simple picture showing several spectra, each at a different microwave frequency? - Astrochemist 02:24, 23 May 2007 (UTC)
I agree with what you wrote above. I changed the picture with the nitroxide spectra (now a bit fuzzy) and I see that you've altered ge. -- Yesterday I traced the high-field EPR material to a Russian lab's web pages, and added the appropriate link. Since those pages have a copyright notice, I'm not sure how much of their material can be used in this particular Wikipedia article. -- Astrochemist 15:37, 24 May 2007 (UTC)
The article supplies an equation for sensitivity and refers to the "minimum number of detectable spins" but doesn't specify the conditions. I believe this is the minimum detectable spins for a signal-to-noise ratio of 1? Furthermore, no definition or reference is provided for the constant k1. A reference would be very helpful here. One possible reference is Rinard et. al. Chompx ( talk) 23:22, 18 May 2010 (UTC)
It would also be nice to add a section describing line broadening and the relevance of the Bloch equations. Chompx ( talk) 23:22, 18 May 2010 (UTC)
NMR spectroscopists usually interpret changes in line positions in terms of shielding constants (), but EPR spectroscopists usually interpret changes in line positions in terms of g-value variations caused by spin-orbit coupling. This Wikipedia article has both, so I'd like to remove the shielding constant material. (It can always be put back in if I'm wrong.) -- Astrochemist 19:21, 24 May 2007 (UTC)
The magnetic moment of an electron is approximately the Bohr magneton, it is NOT the gyromagnetic ratio of the electron times the Bohr magneton (which would approximately be the Larmor frequency). Changes in the resonance frequency of an electron in a chemical environment do not arise from changes in either the spin angular momentum or the gyromagnetic ratio. The former is a fundamental property of any spin 1/2 particle, while the latter is a fundamental property of the electron. Rather, the coupling of the electron magnetic moment to nuclear magnetic dipoles, or the spin-orbit coupling alters the energy difference between the spin up and spin down states, leading to a frequency change the provides information about the chemical environment. In simpler terms, the local magnetic field an electron experiences depends on it environment, so different chemicals cause slighty different field strengths at the electron, and thus shifted resonance curves (and different linewidths!).
How is elecron spin resonance used to date material?
Can ESR be used as a technique for analysis of antioxidants???
I think it would be extremely beneficial to add a graphic to describe the technique. One example that I have seen is on YouTube here. Any help would be appreciated! -- MarsInSVG ( talk) 16:46, 4 October 2011 (UTC)
The section labelled "Miniature electron spin resonance spectroscopy with Micro-ESR" seems to not fit properly, as several things that are listed under this headline do not belong to "micro-ESR" but rather to the previous section "Applications". I suggest removing the unreferenced text from "Miniature electron spin resonance spectroscopy with Micro-ESR" up to "Applications include real-time monitoring of free radical containing asphaltenes in (crude) oils, biomedical R&D to measure oxidative stress, evaluation of the shelf life of food products." After this removal, the remainder should fit consistently into "Applications". HBook ( talk) 16:49, 9 December 2016 (UTC)
Please could someone review the section on the hardware involved in making the EPR measurement (Hardware components) and check the accuracy of the information presented. EvilxFish ( talk) 15:20, 3 July 2017 (UTC)
The following section was removed: " Miniature electron spin resonance spectroscopy with Micro-ESR: Miniaturisation of military radar technologies allowed the development of miniature microwave electronics as spin-offs by the California Institute of Technology and Rice University. Since 2007 these sensors have been employed in miniaturized electron spin resonance spectrometers called Micro-ESR. Applications include real-time monitoring of free radical containing asphaltenes in (crude) oils, biomedical R&D to measure oxidative stress, evaluation of the shelf life of food products.<ref>Yang X., Chen C., Seifi P., Babakhani A., Integrated electron spin resonance spectrometer, US Patent 9689954</ref>" -- Smokefoot ( talk) 15:49, 1 January 2018 (UTC)
![]() | This ![]() It is of interest to the following WikiProjects: | ||||||||||||||||||||||||||||||||||||||||||||||
|
![]() | The contents of the Electron spin resonance page were merged into Electron paramagnetic resonance. For the contribution history and old versions of the redirected page, please see its history; for the discussion at that location, see its talk page. |
I moved this talk page, and the article's contents, to Electron Paramagnetic Resonance because essentially everything on the page referred to EPR, not ESR. - Astrochemist 19:10, 25 May 2007 (UTC)
Surely EPR and ESR are just different terms for exactly the same thing? 130.88.80.227 ( talk) 13:06, 9 January 2012 (UTC)
Equation cannot be read in the text. Please modify the format so that it appears correctly. —Preceding unsigned comment added by 220.227.97.99 ( talk) 14:11, 22 January 2010 (UTC)
I moved some of the introductory material to sections further down in the article. This allows the reader to see the contents box more easily. - Astrochemist 03:37, 10 May 2007 (UTC)
I removed the following:
I deleted the above sentence as I could not readily see how raising a spectrometer's frequency would cause the upper energy state to be more populated. It seems that just the opposite would be true. Am I missing something? - Astrochemist 04:43, 22 May 2007 (UTC)
Do we need an animated gif in the final section? How about a simple picture showing several spectra, each at a different microwave frequency? - Astrochemist 02:24, 23 May 2007 (UTC)
I agree with what you wrote above. I changed the picture with the nitroxide spectra (now a bit fuzzy) and I see that you've altered ge. -- Yesterday I traced the high-field EPR material to a Russian lab's web pages, and added the appropriate link. Since those pages have a copyright notice, I'm not sure how much of their material can be used in this particular Wikipedia article. -- Astrochemist 15:37, 24 May 2007 (UTC)
The article supplies an equation for sensitivity and refers to the "minimum number of detectable spins" but doesn't specify the conditions. I believe this is the minimum detectable spins for a signal-to-noise ratio of 1? Furthermore, no definition or reference is provided for the constant k1. A reference would be very helpful here. One possible reference is Rinard et. al. Chompx ( talk) 23:22, 18 May 2010 (UTC)
It would also be nice to add a section describing line broadening and the relevance of the Bloch equations. Chompx ( talk) 23:22, 18 May 2010 (UTC)
NMR spectroscopists usually interpret changes in line positions in terms of shielding constants (), but EPR spectroscopists usually interpret changes in line positions in terms of g-value variations caused by spin-orbit coupling. This Wikipedia article has both, so I'd like to remove the shielding constant material. (It can always be put back in if I'm wrong.) -- Astrochemist 19:21, 24 May 2007 (UTC)
The magnetic moment of an electron is approximately the Bohr magneton, it is NOT the gyromagnetic ratio of the electron times the Bohr magneton (which would approximately be the Larmor frequency). Changes in the resonance frequency of an electron in a chemical environment do not arise from changes in either the spin angular momentum or the gyromagnetic ratio. The former is a fundamental property of any spin 1/2 particle, while the latter is a fundamental property of the electron. Rather, the coupling of the electron magnetic moment to nuclear magnetic dipoles, or the spin-orbit coupling alters the energy difference between the spin up and spin down states, leading to a frequency change the provides information about the chemical environment. In simpler terms, the local magnetic field an electron experiences depends on it environment, so different chemicals cause slighty different field strengths at the electron, and thus shifted resonance curves (and different linewidths!).
How is elecron spin resonance used to date material?
Can ESR be used as a technique for analysis of antioxidants???
I think it would be extremely beneficial to add a graphic to describe the technique. One example that I have seen is on YouTube here. Any help would be appreciated! -- MarsInSVG ( talk) 16:46, 4 October 2011 (UTC)
The section labelled "Miniature electron spin resonance spectroscopy with Micro-ESR" seems to not fit properly, as several things that are listed under this headline do not belong to "micro-ESR" but rather to the previous section "Applications". I suggest removing the unreferenced text from "Miniature electron spin resonance spectroscopy with Micro-ESR" up to "Applications include real-time monitoring of free radical containing asphaltenes in (crude) oils, biomedical R&D to measure oxidative stress, evaluation of the shelf life of food products." After this removal, the remainder should fit consistently into "Applications". HBook ( talk) 16:49, 9 December 2016 (UTC)
Please could someone review the section on the hardware involved in making the EPR measurement (Hardware components) and check the accuracy of the information presented. EvilxFish ( talk) 15:20, 3 July 2017 (UTC)
The following section was removed: " Miniature electron spin resonance spectroscopy with Micro-ESR: Miniaturisation of military radar technologies allowed the development of miniature microwave electronics as spin-offs by the California Institute of Technology and Rice University. Since 2007 these sensors have been employed in miniaturized electron spin resonance spectrometers called Micro-ESR. Applications include real-time monitoring of free radical containing asphaltenes in (crude) oils, biomedical R&D to measure oxidative stress, evaluation of the shelf life of food products.<ref>Yang X., Chen C., Seifi P., Babakhani A., Integrated electron spin resonance spectrometer, US Patent 9689954</ref>" -- Smokefoot ( talk) 15:49, 1 January 2018 (UTC)