Re: [math-fun] 247 zeptosecond time interval measured
----- Zepto = 10^-21. A single photon ejected the two electrons from a hydrogen molecule. The time interval between the ejections was 247 zs, more or less depending on the orientation of the molecule. https://news.yahoo.com/zeptosecond-femtosecond-163929049.html ----- I may be impressed when I know an upper bound for the maximum possible error. (It took me 246 zeptoseconds plus around a minute to write this post.) —Dan
The error was quoted at about 20%, see: https://arxiv.org/pdf/2010.08298.pdf The yahoo article might have mentioned that 247 zs is just the bond length divided by speed of light. I wouldn’t compare it to a laser pulse shaping, but anyways it’s impressive if they can resolve spatial orientation of a molecule. Most people don’t have equipment like that. —Brad
On Oct 19, 2020, at 9:38 PM, Dan Asimov <dasimov@earthlink.net> wrote:
----- Zepto = 10^-21. A single photon ejected the two electrons from a hydrogen molecule. The time interval between the ejections was 247 zs, more or less depending on the orientation of the molecule.
https://news.yahoo.com/zeptosecond-femtosecond-163929049.html -----
I may be impressed when I know an upper bound for the maximum possible error. (It took me 246 zeptoseconds plus around a minute to write this post.)
—Dan
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I think the picosecond and zeptosecond should be renamed the chicosecond and the zepposecond respectively. I'm not sure how the harposecond and grouchosecond should be defined though. Jim Propp On Tue, Oct 20, 2020 at 1:32 AM Brad Klee <bradklee@gmail.com> wrote:
The error was quoted at about 20%, see:
https://arxiv.org/pdf/2010.08298.pdf
The yahoo article might have mentioned that 247 zs is just the bond length divided by speed of light.
I wouldn’t compare it to a laser pulse shaping, but anyways it’s impressive if they can resolve spatial orientation of a molecule. Most people don’t have equipment like that.
—Brad
On Oct 19, 2020, at 9:38 PM, Dan Asimov <dasimov@earthlink.net> wrote:
----- Zepto = 10^-21. A single photon ejected the two electrons from a hydrogen molecule. The time interval between the ejections was 247 zs, more or less depending on the orientation of the molecule.
https://news.yahoo.com/zeptosecond-femtosecond-163929049.html -----
I may be impressed when I know an upper bound for the maximum possible error. (It took me 246 zeptoseconds plus around a minute to write this post.)
—Dan
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Not likely. But did you wonder why the observation is 400 zs at beta = 0 rather than 273 zs? Bond length is a high precision observable, so what is going on with the difference of ~ 100zs? Is the photon doing annihilation and recreation? Is it taking a non-linear path? Can it be explained in terms of spin networks? Unfortunately 100zs is not enough time for even one joke, so the explanation that the photon stopped briefly to perform a comedy routine with the first electron does not make physical sense. --Brad On Tue, Oct 20, 2020 at 10:04 AM James Propp <jamespropp@gmail.com> wrote:
I think the picosecond and zeptosecond should be renamed the chicosecond and the zepposecond respectively. I'm not sure how the harposecond and grouchosecond should be defined though.
Jim Propp
On Tue, Oct 20, 2020 at 1:32 AM Brad Klee <bradklee@gmail.com> wrote:
The error was quoted at about 20%, see:
https://arxiv.org/pdf/2010.08298.pdf
The yahoo article might have mentioned that 247 zs is just the bond length divided by speed of light.
I wouldn’t compare it to a laser pulse shaping, but anyways it’s impressive if they can resolve spatial orientation of a molecule. Most people don’t have equipment like that.
—Brad
On Oct 19, 2020, at 9:38 PM, Dan Asimov <dasimov@earthlink.net> wrote:
----- Zepto = 10^-21. A single photon ejected the two electrons from a hydrogen molecule. The time interval between the ejections was 247 zs, more or less depending on the orientation of the molecule.
https://news.yahoo.com/zeptosecond-femtosecond-163929049.html -----
I may be impressed when I know an upper bound for the maximum possible error. (It took me 246 zeptoseconds plus around a minute to write this post.)
—Dan
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Groucho Marx was a fast talker, he could tell a very fast joke in 1 groucho-second, This reminds me of something funny about time and speed of computation, if you take the distance made by light between 2 calculations on a fast computer : the distance made by light is somewhere around the thickness of a piece of paper. ... Simon Plouffe Le 2020-10-20 à 17:03, James Propp a écrit :
I think the picosecond and zeptosecond should be renamed the chicosecond and the zepposecond respectively. I'm not sure how the harposecond and grouchosecond should be defined though.
Jim Propp
On Tue, Oct 20, 2020 at 1:32 AM Brad Klee <bradklee@gmail.com> wrote:
The error was quoted at about 20%, see:
https://arxiv.org/pdf/2010.08298.pdf
The yahoo article might have mentioned that 247 zs is just the bond length divided by speed of light.
I wouldn’t compare it to a laser pulse shaping, but anyways it’s impressive if they can resolve spatial orientation of a molecule. Most people don’t have equipment like that.
—Brad
On Oct 19, 2020, at 9:38 PM, Dan Asimov <dasimov@earthlink.net> wrote:
----- Zepto = 10^-21. A single photon ejected the two electrons from a hydrogen molecule. The time interval between the ejections was 247 zs, more or less depending on the orientation of the molecule. https://news.yahoo.com/zeptosecond-femtosecond-163929049.html -----
I may be impressed when I know an upper bound for the maximum possible error. (It took me 246 zeptoseconds plus around a minute to write this post.)
—Dan
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Fast CPUs run at a few GHz so light travels a few inches per cycle. The fastest CPUs have such a short cycle that a signal can't reliabily cross them in one cycle and that's why they are divided into four or more subprocessors. Brent On 10/20/2020 10:03 AM, Simon Plouffe wrote:
Groucho Marx was a fast talker, he could tell a very fast joke in 1 groucho-second,
This reminds me of something funny about time and speed of computation, if you take the distance made by light between 2 calculations on a fast computer : the distance made by light is somewhere around the thickness of a piece of paper. ...
Simon Plouffe
Le 2020-10-20 à 17:03, James Propp a écrit :
I think the picosecond and zeptosecond should be renamed the chicosecond and the zepposecond respectively. I'm not sure how the harposecond and grouchosecond should be defined though.
Jim Propp
On Tue, Oct 20, 2020 at 1:32 AM Brad Klee <bradklee@gmail.com> wrote:
The error was quoted at about 20%, see:
https://arxiv.org/pdf/2010.08298.pdf
The yahoo article might have mentioned that 247 zs is just the bond length divided by speed of light.
I wouldn’t compare it to a laser pulse shaping, but anyways it’s impressive if they can resolve spatial orientation of a molecule. Most people don’t have equipment like that.
—Brad
On Oct 19, 2020, at 9:38 PM, Dan Asimov <dasimov@earthlink.net> wrote:
----- Zepto = 10^-21. A single photon ejected the two electrons from a hydrogen molecule. The time interval between the ejections was 247 zs, more or less depending on the orientation of the molecule. https://news.yahoo.com/zeptosecond-femtosecond-163929049.html -----
I may be impressed when I know an upper bound for the maximum possible error. (It took me 246 zeptoseconds plus around a minute to write this post.)
—Dan
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participants (5)
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Brad Klee -
Brent Meeker -
Dan Asimov -
James Propp -
Simon Plouffe