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Full-Text Articles in Physics
Co2 Diffusion Through Gelatin Experiment, Jennifer Welborn
Co2 Diffusion Through Gelatin Experiment, Jennifer Welborn
STEM Digital
An example of measuring lengths.
Transient Diffraction Grating Measurements Of Molecular Diffusion In The Undergraduate Laboratory, Daniel Spiegel, Santona Tuli
Transient Diffraction Grating Measurements Of Molecular Diffusion In The Undergraduate Laboratory, Daniel Spiegel, Santona Tuli
Physics and Astronomy Faculty Research
Mass diffusion is a central process in many biological, chemical, and physical systems, and although the mathematics of diffusion has long been an important component of an undergraduate physics education, experimental measurements of diffusion are not very common in the undergraduate laboratory. We describe here an experiment that employs the interference of laser beams to allow measurement of molecular diffusion on micron length scales. The interference fringes of two intersecting “pump” beams within a dye solution create a sinusoidal distribution of long-lived molecular excited states. A third “probe” beam is incident at a wavelength at which the indices of refraction …