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DTSTART:20260329T030000
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DTSTAMP:20260727T080054Z
UID:1788951600@ist.ac.at
DTSTART:20260909T130000
DTEND:20260909T140000
DESCRIPTION:Speaker: Andrea Stöllner\nhosted by Jorryt Matthee\nAbstract: 
 Charge accumulation on aerosol particles plays an important role in a vari
 ety of natural and industrial processes. An example is cloud electrificati
 on\, in which collisions between ice crystals and graupel cause large amou
 nts of charge to be exchanged between airborne particles. Optical tweezers
  are a highly specialized tool that can hold a single micrometer-sized air
 borne particle stably in the same position over weeks while measuring its 
 electric charge with elementary-charge resolution. In this work\, we show 
 that the trapping laser can also be used to give charge to the micropartic
 le. Via a two-photon process the particle acquires more and more positive 
 charge\, enabling us to study its electrical behavior from uncharged up to
  multiple hundred elementary charges. By studying the dynamics of such hig
 hly charged particles over days and weeks we find that they spontaneously 
 undergo microdischarges which range from just a few to several hundred ele
 mentary charges. We show that these discharges are triggered by cosmic-ray
  muons which pass through the air close to the particle and supply the ion
 s needed to cause charge loss. Our findings highlight the potential of aer
 osol optical tweezers to provide new insights into microscale charging and
  discharging phenomena\, with implications for both fundamental studies an
 d atmospheric electrification processes.
LOCATION:Central Bldg / O1 / Mondi 3 (I01.O1.010)\, ISTA
ORGANIZER:
SUMMARY:Andrea Stöllner: Thesis Defense: Microscale Electrical Behavior of
  Highly Charged Individual Aerosol Particles Using Optical Tweezers
URL:https://talks-calendar.ista.ac.at/events/6572
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