Frontiers in Spectroscopy

Chemical Physics 880 and 880A

Winter 2006

Course Description: This course will provide students with an overview of topics on the frontier of spectroscopic research. It will exploit internationally renowned lecturers, as well as outstanding OSU faculty, to cover topics ranging from very fundamental to quite applied. General areas to be covered will include fundamental characteristics of molecular quantum structure, electromagnetics, new experimental techniques, remote sensing, ultra-high sensitivity analytical techniques, astrophysical applications, etc. It is planned that the course will be offered multiple times, with topics and speakers varying with each offering. The lecturers for the upcoming Winter quarter are listed below.

Each topic will be covered by lectures on Wednesday and Friday mornings, 9:00-10:18AM, in MP2015.

Thursdays discussions this year only will begin at 8:45-9:55AM on Thursdays in MP2015.

PLEASE NOTE: Dongping Zhong's lectures Wednesday January 18 and Friday January 20 will begin at 9:30am.

Prerequisites: Chemistry 862 or Physics 828 or permission of the instructor

Required Text: None; suggested articles for reading will be supplied prior to the lecture on a given topic.

A note regarding WebCT: All readings and lecture notes are located on WebCT. If you were enrolled for Frontiers this quarter, you have your normal student login and password. If you are an advisor or post-doc and would like access to the readings and notes, email Becky Gregory, gregory.10@osu.edu, and she will arrange for a login and password for this site.

List of speakers and dates scheduled:

January 11-13 Robert Boyd - University of Rochester

Recommended readings as well as the lecture notes are located on WebCT
Readings: Bentley, Bigelow-Ruby-PRL, Boto-Dowling, Fast=Slow-Bigelow-Science, Gauthier-Boyd, and GSA-Quantum-Litho

• Lecture 1
  Fundamentals and Applications of "Slow Light"
  
  Research performed over the past several years has demonstrated new methods for controlling the velocity of propagation of pulses of light through material systems.  Ultra slow velocities (tens of meters per second) and ultra fast velocities (including negative velocities) have been demonstrated.  This talk will commence with an overview of this field and will include a discussion of some new ideas for applications of fast and slow light based on the use of room temperature solids.

• Lecture 2 - Quantum Imaging:  Enhanced Image Formation Using Entangled Photons

Image formation making use of quantum states of light allow dramatic new possibilities in the field of image science.  In this contribution, we review some of the conceptual possibilities afforded by quantum imaging and describe some recent work that displays some of these features.
 

January 18-20 Dongping Zhong - The Ohio State University

PLEASE NOTE: Dongping Zhong's lectures Wednesday January 18 and Friday January 20 will begin at 9:30am.

Recommended readings as well as the lecture notes are located on WebCT Readings: AHZ-Chem.Rev.-04 , DZ-CPL-04, DZ-JPCB-05 SA-Chem.Rev.-03 , DZ-JPCB-04, DZ-PNAS-05

• Lecture 1 - Ultrafast dynamics of biological water
  In this lecture, we present our recent development of femtosecond spectroscopy combining with molecular biology methods for study of hydration dynamics in proteins. The dynamics of biological water at protein surfaces is fundamental to protein structure and function. The intrinsic tryptophan residue is established as a local optical probe and is engineered to scan protein surfaces by site-directed mutation. Spatial and temporal hydration heterogeneity is for the first time characterized in several proteins. Dynamical hydration patterns are evaluated in terms of the local topography and chemical identity. These results provide a molecular basis for the understanding of protein-water interactions, a topic central to protein science.

• Lecture 2 - Dynamic control of biological efficiency
  In this lecture, we first review several classic biological systems involving ultrafast primary events as key functional pathways. Then we will focus our recent studies of photolyase, a classic photoenzyme using light energy to split ultraviolet-induced cyclobutane pyrimidine dimers in damaged DNA, but the molecular mechanism has never been directly revealed. Here, we report the direct mapping of catalytic processes through femtosecond synchronization of the enzymatic dynamics with the repair function. We observed the complete functional evolution by following the dynamics of reactions species with a high-sensitive transient absorption method. The results show that the photocycle of DNA repair by photolyase is through a radical mechanism and completed on subnanosecond time scale at the dynamic active site with no net electron change in redox states of the flavin cofactor.

Recommended readings as well as the lecture notes are located on WebCT
Readings: M+(L)Ann Rev Phys Chem, IR-IREV, NJC-Frontiers

• Lecture 1
  Introduction to metal ion complexes and their study with electronic photodissociation spectroscopy. This will cover some of our older work on Mg+ and Ca+ complexes based on their 2S -> 2P atomic transitions solvated by the attachment of rare gas atoms or small molecules. The reading material for this day is our Ann. Rev. Phys. Chem. article from 1997.

• Lecture 2
  The focus will be on some instrumental aspects involved in making the metal ion complexes with laser vaporization. I will discuss cooling, cluster growth, ion-electron recombination chemistry and other details of how we make cold cation-molecular complexes.

• Lecture 3
  I will cover our more recent work on the infrared photodissociation spectroscopy of cation-molecular complexes. The reading material for this includes our Intl Rev. article from 2003 and a recent New Journal of Chemistry review from 2005.

Recommended readings as well as the lecture notes are located on WebCT

Recommended readings are located on WebCT
Readings: AO_CRDS, AOBI, CST_calcrdslif LP59545 JOSABscan

• Lecture 1 (Wednesday Lecture, 9:00-10:18am 2015MP) - Ballistic Imaging for the Near Field in an Atomizing Spray

  Ballistic imaging is an optical technique that was originally developed for imaging through tissue. As it turns out, the near field of an atomizing spray (at the tip where it exits) has almost the same optical depth as human tissue, caused by a dense fog of very small droplets. For this reason, spray breakup physics in the near field has been the missing link in a complete description of spray breakup. We have recently demonstrated that transient ballistic imaging using an amplified short pulse laser system can provide images of liquid core breakup in atomizing sprays. This talk will describe the technique, present a few spray results, and discuss potential new directions.

• Student Discussion (Wednesday, 5:30-6:48pm 2015MP) - A tutorial on the DME with a case study - pump/probe.

• Lecture 2 - (Thursday Lecture, 8:45am-9:55am 2015MP, is for faculty and grad students) Pulsed Cavity Ringdown Spectroscopy

  Many forms of absorption spectroscopy have been developed over time, with various levels of sensitivity. One of the advantages of pulsed cavity ringdown spectroscopy is that it can be used with very common pulsed laser systems to achieve very high sensitivity. In this talk, models for the intracavity mode structure will be discussed, together with implications for system stability and design. Several applications will be presented, and then a few other related techniques will be discussed.  

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  Grading: Satisfactory/Unsatisfactory options: Class attendance and participation

  Letter grade option: Class attendance and participation plus term paper

  (Grades will be assigned solely by OSU faculty.)  

  04270-7 (3 hours) Call number for ChemPhys 880 (S/U option)

  04271-2 (3 hours) Call number for ChemPhys 880A (letter grade option prerequisite=a previous spectroscopy course at OSU in Chemistry or Physics or prior permission of the instructor)

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  Chemical Physics 894 - 1998 Chemical Physics 894 - 1999 Chemical Physics 894 - 2000 Physics 880G20 - 2001 Physics 880G20 - 2002 Chemical Physics 894 - 2003 Chemical Physics 880 - 2004 Chemical Physics 880 - 2005