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Vibrational delocalization in ammonia aerosol particles
(2004)The Journal of Chemical PhysicsThe present contribution investigates shape effects and surface effects in the infrared spectra of pure (NH3) and mixed ( NH3–CO2 and NH3–NH2D–NHD2–ND3) ammonia particles with sizes between about 1 and 50 nm. The particles investigated have been generated in a collisional cooling cell as aerosols at temperatures between 20 and 80 K. The contribution reveals that only the combination with a microscopic model ...Journal Article -
Phase Behavior of Methane Haze
(2007)Physical Review LettersMethane aerosols play a fundamental role in the atmospheres of Neptune, Uranus, and Saturn’s moon Titan as borne out by the recent Cassini-Huygens mission. Here we present the first study of the phase behavior of free methane aerosol particles combining collisional cooling with rapid-scan infrared spectroscopy in situ. We find fast (within minutes) phase transitions to crystalline states directly after particle formation and characteristic ...Journal Article -
The competition between hydrogen bonding and chemical change in carbohydrate nanoparticles
(2002)The Journal of Chemical PhysicsBroad band Fourier transform infrared spectroscopy was used to study the competition between hydrogen bonding and conformational and chemical changes in molecular nanoparticles. Particles of small carbohydrates (dihydroxyacetone, glyceraldehyde, fructose, and glucose) with sizes between 20 and 100 nm served as model systems. The variation of the preparation conditions allowed to control the chemical composition of the particles. For ...Journal Article