Meeting Information

    Meeting/Event Information

    "Water" you doing with that synchrotron? (June 2022 Hybrid Meeting)

    June 15, 2022
    5:45 PM - 9:00 PM
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    North Central College, Wentz Science Center
    131 S. Loomis Street
    Naperville, IL 60540
    https://www.northcentralcollege.edu
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    June 2022 Hybrid Meeting

    Dr. timothy w. marin

    professor of Chemistry
    Department of Physical Sciences, Benedictine University, IL

    “Water” You Doing With That Synchrotron?

    Vacuum Ultraviolet Spectroscopy of Subcritical

    and Supercritical Water

    ABSTRACT

    The unique physical and chemical properties of water are discussed, with focus on the strange properties of supercritical water (SCW). A unique vacuum ultraviolet absorption experiment is presented, which allowed the first measurements of the lowest-lying electronic state of high-temperature and SCW, with measurements from room temperature up to and exceeding the critical temperature, and as a function of density above the critical temperature. For subcritical water, the spectrum redshifts considerably with increasing temperature, demonstrating the gradual breakdown of the hydrogen-bond network (H-bond network). Tuning the density above the critical temperature gives insight into the extent of hydrogen bonding in SCW. The known gas-phase spectrum, including its vibronic structure, is duplicated in the low-density limit. With increasing density, the spectrum blueshifts and the vibronic structure is quenched as the water monomer becomes electronically perturbed. Fits to the SCW spectra demonstrate consistency with dimer/trimer fractions calculated from the water virial equation of state and equilibrium constants. Using the known water dimer interaction potential, we estimate the critical distance between molecules (ca. 4.5 Å) needed to explain the vibronic structure quenching.

    In-person Dinner

    Asian-Style Buffet, $30
    North Central College
    Wentz Science Center (Building 19)
    131 S. Loomis St.
    Naperville, IL 60540
    https://www.northcentralcollege.edu/map
     
     

    Virtual Talk

    FREE via Zoom Webinar. However, you must register (at no cost) to obtain the Zoom link.
     

    Registration

    By phone (847-391-9091), email ([email protected]) or online:

    REGISTER HERE      

    Deadlines to register

    Dinner: Noon on Friday, June 10
    Zoom-only: 8:00 PM on Wed, June 15

    PROGRAM

    • 5:45 - 6:00  Registration
    • 6:00 - 7:00  Dinner (In-person
    • 7:00 - 7:05  Announcements - Mark Cesa, Chair
    • 7:05 - 7:10  Presentation of the 2022 Distinguished Service Award to Irene Cesa
    • 7:10 - 7:15  Presentation of the 2022 Emerging Star Award to Jana Markley
    • 7:15 - 7:30  Recognition of 50-, 60, and 70-year Members
    • 7:30 - 8:15  Presentation by Prof. Tim Marin  
    • 8:15 - 8:30  Q&A

     

    QUESTIONS?

    QUESTIONS?  Please contact the Section Office via phone (847-391-9091) or email ([email protected]).

    BIOGRAPHY

    Tim Marin is a Professor in the Department of Physical Sciences at Benedictine University in Lisle, IL, where he has taught chemistry and physics for nearly 20 years. He earned his Ph.D. at Northwestern University and did postdoctoral research at Argonne National Laboratory and the Notre Dame Radiation Laboratory. Prof. Marin has maintained research collaborations and visiting faculty appointments with those institutions as well as with the Synchrotron Radiation Center at the University of Wisconsin-Madison. His research program as a spectroscopist at the boundary of physics and chemistry has led to more than 50 publications on topics ranging from ultrafast photophysics to radiation-induced fast kinetics, radical chemistry, and vacuum ultraviolet spectroscopy. Since 2010, Tim Marin has served on various committees and in various roles for the ACS Chicago Section, including as Director, Budget Director, Councilor, and Section Chair. He is a strong supporter of the liberal arts tradition in Catholic higher ed and enjoys exploring the “great questions” at the interface of science, theology, and philosophy. Prof. Marin is Vice President and founder of the Chicago area chapter of the Society of Catholic Scientists. Tim Marin is also a semi-professional musician, serving as musical director, arranger, and bassist for the Nite Hawks jazz combo, the Tim Marin Orchestra, and the Chi-Town Showstoppers R&B/soul band.

     

    Tickets

    $0.00 Donation to Project SEED (flexible amount)

    $30.00 Member In person Dinner

    $30.00 Non-Member In-person Dinner

    $0.00 Member, Zoom virtual attendance, without Dinner

    $0.00 Non-Member, Zoom virtual attendance, without Dinner

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