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ORGANIZER;CN=Natalie Leung:mailto:[log in to unmask]
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN="SOCAAR-l:
Southern Ontario Centre for Atmospheric Aerosol Research":mailto:SOCAAR-L@l
istserv.utoronto.ca
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=thomas.pre
[log in to unmask]:mailto:[log in to unmask]
ATTACH:CID:[log in to unmask]
DESCRIPTION;LANGUAGE=en-US:Hi Everyone\,\n\nSOCAAR is pleased to announce o
ur next Seminar:\n\n\nWednesday\, March 3\, 2021\n3:00 - 4:00PM\n\nDr. Tho
mas Preston\nAssistant Professor\n\nDepartment of Atmospheric and Oceanic
Sciences\; Department of Chemistry\nMcGill University\n\n\nOptical trappin
g and spectroscopy of single aerosol particles\n\nSpherical aerosol partic
les can act as high-quality factor optical cavities that can support elect
romagnetic whispering gallery modes (WGMs). When single aerosol particles
are held using optical tweezers\, spontaneous Raman scattering can be enha
nced at wavelengths that are commensurate with WGM resonances. This proces
s is known as cavity-enhanced Raman scattering. As WGM resonances are very
sensitive to both particle size and composition\, single particles can be
accurately characterized if the resonance positions are fitted with a sui
table model. For instance\, the radius of a 4 micrometer particle can be d
etermined with an uncertainty of +/- 1 nm by comparing observed resonances
to resonances calculated using Mie theory. This presentation will discuss
methods of modelling and fitting WGMs that can exist in spherical aerosol
particles of atmospheric interest. The examples that will be discussed ar
e (i) the hygroscopic response of homogeneous particles (ii) accurate meas
urements of the complex refractive index and (iii) the relationship betwee
n surface tension and optical deformation.\n______________________________
__________________________________________________\nMicrosoft Teams meetin
g\nJoin on your computer or mobile app\nClick here to join the meeting\nOr call in (audio only)\n+1 647-794-1609\,\,246563798
# Canada\, Toronto\nPhone Conference ID:
246 563 798#\nFind a local number | Reset PIN\nLearn More | Meeting options[log in to unmask]&messageId=0&language=en-US>\n_____________________________
___________________________________________________\n\n
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010000000CA9939CE1E8DC14BAD47BBFAB5F73F6E
SUMMARY;LANGUAGE=en-US:SOCAAR Seminar - Dr. Thomas Preston
DTSTART;TZID=Eastern Standard Time:20210303T150000
DTEND;TZID=Eastern Standard Time:20210303T160000
CLASS:PUBLIC
PRIORITY:5
DTSTAMP:20210224T151708Z
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