A recent paper correctly resolves the paradox of the egg steamer and shares interesting experimen... more A recent paper correctly resolves the paradox of the egg steamer and shares interesting experiments that students can perform. Errors in its argument in favour of this resolution are corrected here.
Quantum mechanical tunneling of the magnetic moment can be observed in several single molecule ma... more Quantum mechanical tunneling of the magnetic moment can be observed in several single molecule magnets, including Mn_12-acetate. It is likely that the mechanism of tunneling involves defects in the crystal structure. These defects may be studied through their effect on the inhomogeneous linewidth of single photon (intrawell) transitions. However, most previous studies of the linewidth have been performed on crystals
ABSTRACT The results of time-domain terahertz spectroscopy experiments on aligned crystals of the... more ABSTRACT The results of time-domain terahertz spectroscopy experiments on aligned crystals of the single-molecule magnet Mn12-acetate are described. When picosecond electromagnetic pulses are passed through the crystals in a time-domain terahertz experiment, in addition to the anticipated absorptions near 300 GHz that correspond to excitations from the ground state (ms = 10) to the first excited state (ms = 9), peaks are also seen in the spectrum at slightly higher frequencies. These peaks are observed to shift with field in the same amounts as the absorptions, and, like the absorptions, they display hysteresis as the field direction is changed.
It would be useful to develop tools to measure building insulation non-invasively and inexpensive... more It would be useful to develop tools to measure building insulation non-invasively and inexpensively. The temperature difference between the surface of an exterior wall and the center of the room is a sensitive measure of the amount of insulation in the wall. We ...
Currently, the only way for homeowners to learn about the effectiveness of their home insulation ... more Currently, the only way for homeowners to learn about the effectiveness of their home insulation is to hire an energy auditor. This difficulty deters homeowners from taking action to improve energy efficiency. We have developed a simple device to measure wall ...
A recent paper correctly resolves the paradox of the egg steamer and shares interesting experimen... more A recent paper correctly resolves the paradox of the egg steamer and shares interesting experiments that students can perform. Errors in its argument in favour of this resolution are corrected here.
Quantum mechanical tunneling of the magnetic moment can be observed in several single molecule ma... more Quantum mechanical tunneling of the magnetic moment can be observed in several single molecule magnets, including Mn_12-acetate. It is likely that the mechanism of tunneling involves defects in the crystal structure. These defects may be studied through their effect on the inhomogeneous linewidth of single photon (intrawell) transitions. However, most previous studies of the linewidth have been performed on crystals
ABSTRACT The results of time-domain terahertz spectroscopy experiments on aligned crystals of the... more ABSTRACT The results of time-domain terahertz spectroscopy experiments on aligned crystals of the single-molecule magnet Mn12-acetate are described. When picosecond electromagnetic pulses are passed through the crystals in a time-domain terahertz experiment, in addition to the anticipated absorptions near 300 GHz that correspond to excitations from the ground state (ms = 10) to the first excited state (ms = 9), peaks are also seen in the spectrum at slightly higher frequencies. These peaks are observed to shift with field in the same amounts as the absorptions, and, like the absorptions, they display hysteresis as the field direction is changed.
It would be useful to develop tools to measure building insulation non-invasively and inexpensive... more It would be useful to develop tools to measure building insulation non-invasively and inexpensively. The temperature difference between the surface of an exterior wall and the center of the room is a sensitive measure of the amount of insulation in the wall. We ...
Currently, the only way for homeowners to learn about the effectiveness of their home insulation ... more Currently, the only way for homeowners to learn about the effectiveness of their home insulation is to hire an energy auditor. This difficulty deters homeowners from taking action to improve energy efficiency. We have developed a simple device to measure wall ...
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