View Full Version : Photon Trap
Ezhuthachan Gopakumar Ramakrishnan
Apr7-04, 09:28 AM
<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>\n\n\n\nHello there,\nCan an electron in a molecule or an atom absorb the photon emitted by\nanother electron but in the same atom or molecule? Can we have such a\nclosed loop trap for a photon?\nGopakumar Ramakrishnan.\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form"> View this Usenet post in original ASCII form </a></div><P></jabberwocky>Hello there,
Can an electron in a molecule or an atom absorb the photon emitted by
another electron but in the same atom or molecule? Can we have such a
closed loop trap for a photon?
Gopakumar Ramakrishnan.
Michael Albert
Apr8-04, 02:31 PM
<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>On Wed, 7 Apr 2004, Ezhuthachan Gopakumar Ramakrishnan wrote:\n> Hello there,\n> Can an electron in a molecule or an atom absorb the photon emitted by\n> another electron but in the same atom or molecule? Can we have such a\n> closed loop trap for a photon?\n> Gopakumar Ramakrishnan.\n\nProbably not quite what you are thinking, but Auger electrons\nare emitted by atoms using energy which otherwise would have\ncaused the emission of an x-ray.\n\nAlso, the following\nhttp://www.mcrc.com/MCRCServlets/servlet/\nMCRCOrderServlet?FormAction=buildmolecularbeacon probelist\nmight be of interest:\n\nMolecular Beacon Probes\n\nMolecular Beacon Probes are DNA oligonucleotides that become\nfluorescent when they hybridize to their target. They are\nhairpin-shaped, single-stranded molecules consisting of a probe\nsequence embedded between complementary sequences that form a\nhairpin stem. A fluorophore is covalently attached to one end of the\noligonucleotide and a non-fluorescent quencher is covalently\nattached to the other end. In the absence of a target, the\nfluorophore is held close to the quencher and fluorescence cannot\noccur. When the probe binds to its target, the greater stability of\nthe probe-target helix forces the stem to unwind resulting in a\nseparation of the fluorophore from the quencher, and fluorescence\ncan occur.\n\nIt might amuse folks in this news group to search the web\nfor "Black Hole Quenchers"! The chemists claim to have\nsuch things :-)\nhttp://www.biosearchtech.com/bhq/\n\nBest wishes,\nMike\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form"> View this Usenet post in original ASCII form </a></div><P></jabberwocky>On Wed, 7 Apr 2004, Ezhuthachan Gopakumar Ramakrishnan wrote:
> Hello there,
> Can an electron in a molecule or an atom absorb the photon emitted by
> another electron but in the same atom or molecule? Can we have such a
> closed loop trap for a photon?
> Gopakumar Ramakrishnan.
Probably not quite what you are thinking, but Auger electrons
are emitted by atoms using energy which otherwise would have
caused the emission of an x-ray.
Also, the following
http://www.mcrc.com/MCRCServlets/servlet/
MCRCOrderServlet?FormAction=buildmolecularbeaconpr obelist
might be of interest:
Molecular Beacon Probes
Molecular Beacon Probes are DNA oligonucleotides that become
fluorescent when they hybridize to their target. They are
hairpin-shaped, single-stranded molecules consisting of a probe
sequence embedded between complementary sequences that form a
hairpin stem. A fluorophore is covalently attached to one end of the
oligonucleotide and a non-fluorescent quencher is covalently
attached to the other end. In the absence of a target, the
fluorophore is held close to the quencher and fluorescence cannot
occur. When the probe binds to its target, the greater stability of
the probe-target helix forces the stem to unwind resulting in a
separation of the fluorophore from the quencher, and fluorescence
can occur.
It might amuse folks in this news group to search the web
for "Black Hole Quenchers"! The chemists claim to have
such things :-)
http://www.biosearchtech.com/bhq/
Best wishes,
Mike
<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>gopan@scientist.com (Ezhuthachan Gopakumar Ramakrishnan) wrote in message news:<a7092960.0404062114.1726c9a5@posting.google. com>...\n> Hello there,\n> Can an electron in a molecule or an atom absorb the photon emitted by\n> another electron but in the same atom or molecule? Can we have such a\n> closed loop trap for a photon?\n> Gopakumar Ramakrishnan.\n\nThis is how the atom is electromagnetically bound. It exchanges\nphotons with nucleus and other electrons. What atomic physicists call\neffective potential is generated by summing over all such photon\nexchanges. But this in reality can be obtained only upto some\napproximation.\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form"> View this Usenet post in original ASCII form </a></div><P></jabberwocky>gopan@scientist.com (Ezhuthachan Gopakumar Ramakrishnan) wrote in message news:<a7092960.0404062114.1726c9a5@posting.google.com>...
> Hello there,
> Can an electron in a molecule or an atom absorb the photon emitted by
> another electron but in the same atom or molecule? Can we have such a
> closed loop trap for a photon?
> Gopakumar Ramakrishnan.
This is how the atom is electromagnetically bound. It exchanges
photons with nucleus and other electrons. What atomic physicists call
effective potential is generated by summing over all such photon
exchanges. But this in reality can be obtained only upto some
approximation.
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