ronald l. grimm
Noyes Room 36, x6543 (626-395-6543)
Email: "grimm" with "@caltech.edu" appended


B.S., 1999, Case Western Reserve University


Ph.D., 2005, Caltech

Ron's work focuses on micron-sized droplets in electric fields. Electrically charged droplets generated with an electrospray ionization source were characterized according to size, velocity, and net charge by a phase doppler anemometer in an atmospheric-pressure ion mobility cell. Field-reversing electronics caused droplets to ping-pong up and down in the mobility cell allowing sequential characterizations on the same droplet. Rayleigh discharge phenomena of hydrocarbon solvents n-heptane, n-octane, and p-xylene were studied and compared to discharge characteristics of the conventional electrospray solvents methanol, water, and acetonitrile.

Later mobility cell and Rayleigh discharge experiments focused how 2-component droplets behaved during Rayleigh discharge. So called binary systems of either 2-methoxyethanol, glycerol, ethylene glycol, or water in combination with methanol where characterized.

Studies of Rayleigh discharge phenomena led to investigations of neutral droplets in electric fields. Neutral droplets in a high electric field will develop regions of opposing charge density. At a critical field, the droplets emit two opposing charged jets. These jets were used as a source of gas-phase ions for mass analysis in a technique named field-induced droplet ionization (FIDI)

Current work studies the dynamics of the FIDI process and new applications in atmospheric and general physical chemistry.

Full C.V. | Publications, Patents, and Recent Presentations


Beauchamp Research Group
Noyes Laboratory of Chemical Physics and the Beckman Institute
Pasadena, California 91125