| Topic: |
Science > Physics |
| User: |
"Gregory L. Hansen" |
| Date: |
18 Jan 2005 02:40:27 PM |
| Object: |
Inelastic Light Scattering? |
I'd read about inelastic x-ray and neutron scattering, and it occured to
me that the same should be true of visible light. Visible light hitting
some arbitrary shiny surface should have some photon-phonon interactions.
But I don't recall seeing that discussed in any of the textbooks. Seems
like it could be a probe of material properties.
--
"The preferred method of entering a building is to use a tank main gun
round, direct fire artillery round, or TOW, Dragon, or Hellfire missile to
clear the first room." -- THE RANGER HANDBOOK U.S. Army, 1992
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| User: "Franz Heymann" |
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| Title: Re: Inelastic Light Scattering? |
19 Jan 2005 12:25:35 AM |
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"Gregory L. Hansen" <glhansen@steel.ucs.indiana.edu> wrote in message
news:csjs7r$tja$1@rainier.uits.indiana.edu...
I'd read about inelastic x-ray and neutron scattering, and it
occured to
me that the same should be true of visible light. Visible light
hitting
some arbitrary shiny surface should have some photon-phonon
interactions.
But I don't recall seeing that discussed in any of the textbooks.
Seems
like it could be a probe of material properties.
Read about Raman scattering.
Physical chemists use it routinely to probe molecules.
Franz
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| User: "Uncle Al" |
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| Title: Re: Inelastic Light Scattering? |
18 Jan 2005 03:55:19 PM |
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"Gregory L. Hansen" wrote:
I'd read about inelastic x-ray and neutron scattering, and it occured to
me that the same should be true of visible light. Visible light hitting
some arbitrary shiny surface should have some photon-phonon interactions.
But I don't recall seeing that discussed in any of the textbooks. Seems
like it could be a probe of material properties.
Impinging circularly polarrized light on a surface imparts angular
momentum. Classic experiment.
Acoustic spectroscopy.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf
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| User: "Gregory L. Hansen" |
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| Title: Re: Inelastic Light Scattering? |
18 Jan 2005 07:27:21 PM |
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In article <41ED85C7.155663B6@hate.spam.net>,
Uncle Al <UncleAl0@hate.spam.net> wrote:
"Gregory L. Hansen" wrote:
I'd read about inelastic x-ray and neutron scattering, and it occured to
me that the same should be true of visible light. Visible light hitting
some arbitrary shiny surface should have some photon-phonon interactions.
But I don't recall seeing that discussed in any of the textbooks. Seems
like it could be a probe of material properties.
Impinging circularly polarrized light on a surface imparts angular
momentum. Classic experiment.
Ellipsometry?
I know of methods involving reflectance or transmission versus angle or
frequency. But I was thinking of a change in frequency, say 600 nm going
in and 620 nm coming out. I don't think I've seen anything like that in
visible light.
Acoustic spectroscopy.
Hmm... The only useful looking hit I found on that one is asking for a
password.
--
"Outside the camp you shall have a place set aside to be used as a
latrine. You shall keep a trowel in your equipment and with it, when you
go outside to ease nature, you shall first dig a hole and afterward cover
up your excrement." -- Deuteronomy 23:13-14
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| User: "Allan Adler" |
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| Title: Re: Inelastic Light Scattering? |
18 Jan 2005 11:25:58 PM |
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(Gregory L. Hansen) writes:
I know of methods involving reflectance or transmission versus angle or
frequency. But I was thinking of a change in frequency, say 600 nm going
in and 620 nm coming out. I don't think I've seen anything like that in
visible light.
I think the passage of light through a crystal counts as scattering.
There are nonlinear crystals that change the frequency of light. I didn't
study any of them but I vaguely recall the acronym KDP (potassium
diphosphate?) as being one. Red light in, green light out. People
also write papers about second harmonic generation with visible light.
--
Ignorantly,
Allan Adler <ara@zurich.csail.mit.edu>
* Disclaimer: I am a guest and *not* a member of the MIT CSAIL. My actions and
* comments do not reflect in any way on MIT. Also, I am nowhere near Boston.
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| User: "Timo Nieminen" |
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| Title: Re: Inelastic Light Scattering? |
18 Jan 2005 07:44:43 PM |
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On Wed, 19 Jan 2005, Gregory L. Hansen wrote:
Uncle Al <UncleAl0@hate.spam.net> wrote:
"Gregory L. Hansen" wrote:
I'd read about inelastic x-ray and neutron scattering, and it occured to
me that the same should be true of visible light. Visible light hitting
some arbitrary shiny surface should have some photon-phonon interactions.
But I don't recall seeing that discussed in any of the textbooks. Seems
like it could be a probe of material properties.
Impinging circularly polarrized light on a surface imparts angular
momentum. Classic experiment.
Ellipsometry?
I know of methods involving reflectance or transmission versus angle or
frequency. But I was thinking of a change in frequency, say 600 nm going
in and 620 nm coming out. I don't think I've seen anything like that in
visible light.
Which reminds me, technically we use a kind of inelastic scattering to
measure rotation frequencies of optically spun microparticles. The two
circular basis polarisation components are frequency shifted in opposite
directions by the particle rotation, and we measure the beats. Of course,
the change in frequency is very, very small compared to the optical
frequency.
--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
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| User: "Gregory L. Hansen" |
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| Title: Re: Inelastic Light Scattering? |
18 Jan 2005 07:51:35 PM |
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In article <Pine.LNX.4.50.0501191139190.9780-100000@localhost>,
Timo Nieminen <timo@physics.uq.edu.au> wrote:
On Wed, 19 Jan 2005, Gregory L. Hansen wrote:
Uncle Al <UncleAl0@hate.spam.net> wrote:
"Gregory L. Hansen" wrote:
I'd read about inelastic x-ray and neutron scattering, and it occured to
me that the same should be true of visible light. Visible light hitting
some arbitrary shiny surface should have some photon-phonon interactions.
But I don't recall seeing that discussed in any of the textbooks. Seems
like it could be a probe of material properties.
Impinging circularly polarrized light on a surface imparts angular
momentum. Classic experiment.
Ellipsometry?
I know of methods involving reflectance or transmission versus angle or
frequency. But I was thinking of a change in frequency, say 600 nm going
in and 620 nm coming out. I don't think I've seen anything like that in
visible light.
Which reminds me, technically we use a kind of inelastic scattering to
measure rotation frequencies of optically spun microparticles. The two
circular basis polarisation components are frequency shifted in opposite
directions by the particle rotation, and we measure the beats. Of course,
the change in frequency is very, very small compared to the optical
frequency.
Beats, that's clever. I knew about Doppler shifting, but measuring a beat
frequency has to be a lot more sensitive than measuring two wavelengths.
--
"Let us learn to dream, gentlemen, then perhaps we shall find the
truth... But let us beware of publishing our dreams before they have been
put to the proof by the waking understanding." -- Friedrich August Kekulé
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| User: "" |
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| Title: Re: Inelastic Light Scattering? |
18 Jan 2005 11:34:53 PM |
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In article <cskef7$3m4$5@rainier.uits.indiana.edu>, (Gregory L. Hansen) writes:
In article <Pine.LNX.4.50.0501191139190.9780-100000@localhost>,
Timo Nieminen <timo@physics.uq.edu.au> wrote:
On Wed, 19 Jan 2005, Gregory L. Hansen wrote:
Uncle Al <UncleAl0@hate.spam.net> wrote:
"Gregory L. Hansen" wrote:
I'd read about inelastic x-ray and neutron scattering, and it occured to
me that the same should be true of visible light. Visible light hitting
some arbitrary shiny surface should have some photon-phonon interactions.
But I don't recall seeing that discussed in any of the textbooks. Seems
like it could be a probe of material properties.
Impinging circularly polarrized light on a surface imparts angular
momentum. Classic experiment.
Ellipsometry?
I know of methods involving reflectance or transmission versus angle or
frequency. But I was thinking of a change in frequency, say 600 nm going
in and 620 nm coming out. I don't think I've seen anything like that in
visible light.
Which reminds me, technically we use a kind of inelastic scattering to
measure rotation frequencies of optically spun microparticles. The two
circular basis polarisation components are frequency shifted in opposite
directions by the particle rotation, and we measure the beats. Of course,
the change in frequency is very, very small compared to the optical
frequency.
Beats, that's clever. I knew about Doppler shifting, but measuring a beat
frequency has to be a lot more sensitive than measuring two wavelengths.
Of course. That's what the cops are using (radar gun).
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
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| User: "Timo Nieminen" |
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| Title: Re: Inelastic Light Scattering? |
18 Jan 2005 08:15:52 PM |
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On Wed, 19 Jan 2005, Gregory L. Hansen wrote:
Timo Nieminen <timo@physics.uq.edu.au> wrote:
Which reminds me, technically we use a kind of inelastic scattering to
measure rotation frequencies of optically spun microparticles. The two
circular basis polarisation components are frequency shifted in opposite
directions by the particle rotation, and we measure the beats. Of course,
the change in frequency is very, very small compared to the optical
frequency.
Beats, that's clever. I knew about Doppler shifting, but measuring a beat
frequency has to be a lot more sensitive than measuring two wavelengths.
At optical frequencies, you generally can't measure the frequency at all.
Beats is the best you can do, but given that one usually wants to know the
frequency shift, not the absolute frequency, that isn't a problem.
--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
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| User: "Timo Nieminen" |
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| Title: Re: Inelastic Light Scattering? |
18 Jan 2005 08:32:16 PM |
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On Wed, 19 Jan 2005, Timo Nieminen wrote:
On Wed, 19 Jan 2005, Gregory L. Hansen wrote:
Timo Nieminen <timo@physics.uq.edu.au> wrote:
Which reminds me, technically we use a kind of inelastic scattering to
measure rotation frequencies of optically spun microparticles. The two
circular basis polarisation components are frequency shifted in opposite
directions by the particle rotation, and we measure the beats. Of course,
the change in frequency is very, very small compared to the optical
frequency.
Beats, that's clever. I knew about Doppler shifting, but measuring a beat
frequency has to be a lot more sensitive than measuring two wavelengths.
At optical frequencies, you generally can't measure the frequency at all.
Beats is the best you can do, but given that one usually wants to know the
frequency shift, not the absolute frequency, that isn't a problem.
Of course, you wrote "wavelengths", which can be measured - though not to
the required precision (at least practically, perhaps impossible even by
impractical means).
--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
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| User: "Timo Nieminen" |
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| Title: Re: Inelastic Light Scattering? |
18 Jan 2005 04:10:36 PM |
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On Tue, 18 Jan 2005, Gregory L. Hansen wrote:
I'd read about inelastic x-ray and neutron scattering, and it occured to
me that the same should be true of visible light. Visible light hitting
some arbitrary shiny surface should have some photon-phonon interactions.
But I don't recall seeing that discussed in any of the textbooks. Seems
like it could be a probe of material properties.
Raman spectroscopy, Brillouin scattering, etc.
--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
.
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| User: "Gregory L. Hansen" |
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| Title: Re: Inelastic Light Scattering? |
18 Jan 2005 07:31:38 PM |
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In article <Pine.LNX.4.50.0501190807430.8543-100000@localhost>,
Timo Nieminen <timo@physics.uq.edu.au> wrote:
On Tue, 18 Jan 2005, Gregory L. Hansen wrote:
I'd read about inelastic x-ray and neutron scattering, and it occured to
me that the same should be true of visible light. Visible light hitting
some arbitrary shiny surface should have some photon-phonon interactions.
But I don't recall seeing that discussed in any of the textbooks. Seems
like it could be a probe of material properties.
Raman spectroscopy, Brillouin scattering, etc.
Some new words for me. I'm not the first person to think of it, then.
And the acoustic mode scattering mentioned in this web site must be the
acoustic spectroscopy that Uncle Al mentioned.
http://hyperphysics.phy-astr.gsu.edu/hbase/optmod/brill.html
--
"I'm giving you the chance to look fate in those pretty eyes of hers
and say, 'Step off, *****. This is my party and you're not invited.'"
-- Chris Shugart, _Testosterone Magazine_
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