Thank you so much for this video! I had gotten desperate to find any videos that would help me understand this phenomenon and technique, since most of them are done by, though very talented, heavy-accented Indians. Since English is my 3rd language, I'm not very good at understanding heavy accents, but I can understand you well, so thank you very much!
I wonder hypothetically, if we have long lived nuclear isomers that are stripped of their electrons and the isomer nuclei are accelerated to relativistic speeds inside a vacuum accelerator. The nuclei would observe incoming photons blueshifted. If we could produce high harmonic generation XUV rays from a stationary laser and shine the XUV rays onto the incoming nuclear isomers would the nuclear isomers see the XUV rays being blueshifted? And if yes would the blueshifted XUV rays come inot resonance with the mossbauer isomer nuclei. And if i am correct would stimulated emission happen? Suppose that the magnets are shitched off so that the zeeman shift is not applicable. The XUV rays would appear as hard x rays to the relativistic nuclei. The XUV rays would appear brighter and the active mossbauer nuclei would have their narrow spectral widths broaden due to time dilation. The XUV rays would appear resonant to the bunch of active nuclei so stimulated emision of resonant gamma rays would occur. Is this scheme correct? Have i the wrong thought? Please help...
It can be performed without Fe57 enrichment, depending on how much time you have and the concentration of iron in your sample. The example in this video is of iron hexacyanoferrate, so the iron concentration is already high, but the data was acquired over several days of measurement. It also depends on how strong your gamma ray source is, which may change over longer times.
Yes, I assume so as long as you have a way of keeping the solvent frozen during the test. The test can take several days. Many publications do tests at low temperatures so it should be no problem. However, I do not think solvated salts remain solvated when the solvent is frozen, maybe non-ionic molecules will remain solvated.
That's a tricky question very often disregarded by scientists : How does freezing affect your samples at the molecular level ? Usually, for this kind of experiments, samples are frozen fast so that molecules don't have time to crystallize (i.e. you try to make a glass). But does that ensure that the molecules are not affected by the change of state ? Probably not. However, the common assumption is that the Fe ion's first coordination sphere (to which Mossbauer is sensitive) will not change significantly upon freezing the sample, even if it contains solvent molecules. Which is a reasonable assumption.
I am currently studying physical chemistry and matter properties in m2 at the university of Strasbourg and your video helped me a lot. I would like to know if you are looking for an interner to help you? I have a 5months internship to find and it would be an honor to do it in your lab. If so, I can write you an email with my student email adress including my CV
Thank you for your interest, unfortunately I am not in a position to be taking on interns at this time. You may try reaching out to other faculty at UW, but I believe funding is a bit tight these days due to the shutdowns.
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Thank you so much for this video! I had gotten desperate to find any videos that would help me understand this phenomenon and technique, since most of them are done by, though very talented, heavy-accented Indians. Since English is my 3rd language, I'm not very good at understanding heavy accents, but I can understand you well, so thank you very much!
Thanks, it was my pleasure!
Fast, brief and easy. Thanks Zachary!
I wonder hypothetically, if we have long lived nuclear isomers that are stripped of their electrons and the isomer nuclei are accelerated to relativistic speeds inside a vacuum accelerator. The nuclei would observe incoming photons blueshifted. If we could produce high harmonic generation XUV rays from a stationary laser and shine the XUV rays onto the incoming nuclear isomers would the nuclear isomers see the XUV rays being blueshifted? And if yes would the blueshifted XUV rays come inot resonance with the mossbauer isomer nuclei. And if i am correct would stimulated emission happen? Suppose that the magnets are shitched off so that the zeeman shift is not applicable. The XUV rays would appear as hard x rays to the relativistic nuclei. The XUV rays would appear brighter and the active mossbauer nuclei would have their narrow spectral widths broaden due to time dilation. The XUV rays would appear resonant to the bunch of active nuclei so stimulated emision of resonant gamma rays would occur. Is this scheme correct? Have i the wrong thought?
Please help...
So Mossbauer Spectroscopy can't be done unless the sample is synthesized with Fe57-enriched reagents?
It can be performed without Fe57 enrichment, depending on how much time you have and the concentration of iron in your sample. The example in this video is of iron hexacyanoferrate, so the iron concentration is already high, but the data was acquired over several days of measurement. It also depends on how strong your gamma ray source is, which may change over longer times.
119Sn is the other common element
Would it be possible to use a frozen sample? In case you want to look at solved molecules
Yes, I assume so as long as you have a way of keeping the solvent frozen during the test. The test can take several days. Many publications do tests at low temperatures so it should be no problem. However, I do not think solvated salts remain solvated when the solvent is frozen, maybe non-ionic molecules will remain solvated.
That's a tricky question very often disregarded by scientists : How does freezing affect your samples at the molecular level ? Usually, for this kind of experiments, samples are frozen fast so that molecules don't have time to crystallize (i.e. you try to make a glass). But does that ensure that the molecules are not affected by the change of state ? Probably not. However, the common assumption is that the Fe ion's first coordination sphere (to which Mossbauer is sensitive) will not change significantly upon freezing the sample, even if it contains solvent molecules. Which is a reasonable assumption.
I am currently studying physical chemistry and matter properties in m2 at the university of Strasbourg and your video helped me a lot. I would like to know if you are looking for an interner to help you? I have a 5months internship to find and it would be an honor to do it in your lab. If so, I can write you an email with my student email adress including my CV
Thank you for your interest, unfortunately I am not in a position to be taking on interns at this time. You may try reaching out to other faculty at UW, but I believe funding is a bit tight these days due to the shutdowns.
Zachary Neale Ok I understand, thank you very much for your answer and your advises
You mentioned that this technique is just limited only to iron. That's when I stopped watching.