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Molecules in sculpted fields: magnet...

Yang, Nan.

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Molecules in sculpted fields: magnetic field effects and multipole transitions.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Molecules in sculpted fields: magnetic field effects and multipole transitions./
Author:	Yang, Nan.
Description:	115 p.
Notes:	Source: Dissertation Abstracts International, Volume: 74-06(E), Section: B.
Contained By:	Dissertation Abstracts International74-06B(E).
Subject:	Physical chemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3553507
ISBN:	9781267929884

Molecules in sculpted fields: magnetic field effects and multipole transitions.
Yang, Nan.

Molecules in sculpted fields: magnetic field effects and multipole transitions. - 115 p.

Source: Dissertation Abstracts International, Volume: 74-06(E), Section: B.

Thesis (Ph.D.)--Harvard University, 2013.

This item is not available from ProQuest Dissertations & Theses.

This thesis describes work related to the theme of sculpted electromagnetic fields - engineered fields with particular spatial patterns---and their interactions with molecules. We are motivated by the following questions: what are ways of detecting spatial patterns in electromagnetic fields? What are possible applications of spatially engineered fields? Are there molecular transitions that are dark to plane waves but that can be probed by sculpted fields?

ISBN: 9781267929884Subjects--Topical Terms:

1981412
Physical chemistry.

Molecules in sculpted fields: magnetic field effects and multipole transitions.
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020 $a 9781267929884
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100 1 $a Yang, Nan. $3 1273667
245 1 0 $a Molecules in sculpted fields: magnetic field effects and multipole transitions.
300 $a 115 p.
500 $a Source: Dissertation Abstracts International, Volume: 74-06(E), Section: B.
500 $a Adviser: Adam E. Cohen.
502 $a Thesis (Ph.D.)--Harvard University, 2013.
506 $a This item is not available from ProQuest Dissertations & Theses.
506 $a This item must not be sold to any third party vendors.
520 $a This thesis describes work related to the theme of sculpted electromagnetic fields - engineered fields with particular spatial patterns---and their interactions with molecules. We are motivated by the following questions: what are ways of detecting spatial patterns in electromagnetic fields? What are possible applications of spatially engineered fields? Are there molecular transitions that are dark to plane waves but that can be probed by sculpted fields?
520 $a The first part of this thesis is in the area of magnetic field effects in chemistry. We focus on magnetic field modulated fluorescence, which provides a convenient method for imaging magnetic field strength. We proposed and demonstrated a fluorescence technique that allows imaging through strongly scattering media. We achieve this by exploiting the fact that most materials do not scatter magnetic field. This allows us to project a magnetic field pattern beyond the scattering surface. The magnetic field dependent fluorescence then allows us to map out the object of interest. We constructed a setup that demonstrates 2D imaging using this technique. We synthesized new molecular systems to enhance the sensitivity to magnetic field. We characterized and compared these molecules with steady state fluorescence spectroscopy, transient fluorescence and transient absorption measurements. The results reveal patterns that point to directions for engineering chemical systems to further enhance their magnetic field sensing properties.
520 $a The second portion of this thesis is a theoretical study of the molecular multipole transitions and their couplings to local electromagnetic quantities. Using a semiclassical approach, we performed a multipole expansion of molecular transitions driven by monochromatic radiation. We derived the local electromagnetic quantities that couple to different multipole transitions and observables such as circular dichroism and magnetic circular dichroism. It was observed that certain transitions are dark to plane waves, but could be probed by simple spatial arrangements such as superpositions of plane waves. Experiments for their detection are also proposed.
590 $a School code: 0084.
650 4 $a Physical chemistry. $3 1981412
650 4 $a Electromagnetics. $3 3173223
690 $a 0494
690 $a 0607
710 2 $a Harvard University. $b Engineering and Applied Sciences. $3 2093136
773 0 $t Dissertation Abstracts International $g 74-06B(E).
790 $a 0084
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3553507