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Xavier University of Louisiana

2 ARTICLES PUBLISHED IN JoVE

JoVE Core

Scanning-probe Single-electron Capacitance Spectroscopy

Kathleen A. Walsh¹, Megan E. Romanowich¹, Morewell Gasseller^1,2, Irma Kuljanishvili^1,3, Raymond Ashoori⁴, Stuart Tessmer¹

¹Department of Physics and Astronomy, Michigan State University, ²Department of Chemistry & Biochemistry/Physics, Mercyhurst University, ³Department of Physics, Saint Louis University, ⁴Department of Physics, Massachusetts Institute of Technology

Scanning-probe single-electron capacitance spectroscopy facilitates the study of single-electron motion in localized subsurface regions. A sensitive charge-detection circuit is incorporated into a cryogenic scanning probe microscope to investigate small systems of dopant atoms beneath the surface of semiconductor samples.

Environment

Measurement of Aerosols Optical Thickness of the Atmosphere using the GLOBE Handheld Sun Photometer

Maryssa Bradley¹, Morewell Gasseller¹

¹Department of Physics, Xavier University of Louisiana

The goal of the methods presented here is to measure aerosol optical thickness of the atmosphere. The sun photometer is pointed at the sun and the largest voltage reading obtained on an in-built digital voltmeter is recorded. Atmospheric measurements such as barometric pressure and relative humidity are also performed.