2018-04-15 16:11

1 files changed, 20 insertions, 10 deletions

diff --git a/introduction/chapter.tex b/introduction/chapter.tex
index f6adc46..b3d9df5 100644
--- a/introduction/chapter.tex
+++ b/introduction/chapter.tex
@@ -16,10 +16,10 @@
 

 Coherent multidimensional spectroscopy (CMDS) is a family of experimental strategies capable of

 providing unique insights into microscopic material physics.  %

-It is similar to more familiar multidimensional NMR experiments \cite{ZhaoWei2000b,

-  PakoulevAndreiV2006a}, although the implementation is different due to differences between the

-behavior of nuclear spin states (probed by NMR) and electronic and vibrational states (probed by

-CMDS).  %

+It is similar to more familiar multidimensional NMR experiments \cite{KeustersDorine1999a,

+  ZhaoWei2000b, PakoulevAndreiV2006a}, although the implementation is different due to differences

+between the behavior of nuclear spin states (probed by NMR) and electronic and vibrational states

+(probed by CMDS).  %

 CMDS can resolve couplings between states, and can decongest spectra by taking advantage of

 dimensionality and selection rules.  %

 With the advent of ultrafast lasers, CMDS can resolve dynamics in excited states and the coupling

@@ -146,6 +146,16 @@ complementary to chopping.  %
 Automated poynting correction and power correction can account for non-idealities in OPA

 performance.  %

 

+MR-CMDS instruments rely on OPAs as tunable light sources.  %

+OPAs are very sensitive to changes in upstream lasers and lab conditions, so OPA tuning is

+regularly required.  %

+Manual OPA tuning can easily take a full day of human effort. %

+Furthermore, manual tuning typically results in inferior tuning curves, since it is difficult for

+humans to consider all available information simultaneously.  %

+Automated OPA tuning makes OPA upkeep easier, faster and more reproducible, facilitating higher

+throughput, higher quality frequency domain experiments. %

+Chapter \ref{cha:opa} describes fully automated tuning algorithms which I have developed.  %

+

 The theory that is used to describe CMDS is typically derived in one of two limits.  %

 In the impulsive limit, pulses are broad in frequency and short in time compared to material

 resonances.  %

@@ -183,8 +193,8 @@ They are easy to synthesize, store and prepare in the solution phase, and they h
 relatively narrow band-edge excitons which are easy to interrogate using MR-CMDS.  %

 In \autoref{cha:pss}, we describe a simple approach to extracting the quantitative third-order

 susceptibility of PbSe quantum dots using MR-CMDS.  %

-Using a simple approach of standard dilutions, we define this susceptibility in ratio to the known

-well-quantified susceptibility of our solvent and cuvette windows.  %

+Using standard dilutions, we define this susceptibility in ratio to the known well-quantified

+susceptibility of our solvent and cuvette windows.  %

 A few-parameter model is employed to extract this ratio.  %

 We are optimistic that this approach will be generally applicable, making it simple to perform

 quantitative solution-phase MR-CMDS.  %

@@ -213,23 +223,23 @@ frequency-frequency-delay transient grating spectroscopy to understand the basic
 dynamics of MoS\textsubscript{2}.  %

 We show that the band-edge excitons of MoS\textsubscript{2} are not easily resolved, and the

 dynamics of MoS\textsubscript{2} are fast.  %

-We develop a picture of MoS\textsubscript{2} electronic states that is consistent with our

+We describe a picture of MoS\textsubscript{2} electronic states that is consistent with our

 results.  %

 

 In \autoref{cha:pps} we use MR-CMDS to interrogate the dynamics of electronic states of

-(PEDOT:PSS).  %

+PEDOT:PSS.  %

 PEDOT:PSS is a transparent, electrically conductive polymer.  %

 The exact origin of the conductivity is not well understood, so it is unclear how to improve the

 conductivity or synthesize other conductive polymers.  %

 We performed photon echo experiments on PEDOT:PSS, directly interrogating the electronic states

-that are responsible for conductivity in the polymer.  %

+that are speculated to participate in conductivity.  %

 Using a sophisticated model extended from the work in \autoref{cha:mix}, we constrain the pure and

 ensemble dephasing lifetimes of PEDOT:PSS.  %

 These lifetimes can be directly related to the homogeneous and inhomogeneous broadening parameters

 in PEDOT:PSS.  %

 Amazingly, we find that PEDOT:PSS has very broad homogeneous \emph{and} inhomogeneous

 linewidths.  %

-We cannot constrain either quantity, but we can put lower limits on both.  %

+We cannot fully determine either quantity, but we can put lower limits on both.  %

 This basic information is complementary to other experiments in the ongoing effort to fully

 understand PEDOT:PSS.  %