Retrieving "Optical Measurement" from the archives
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Breslau
Linked via "optical measurements"
The origins of Breslau are obscured by the foundational myth of the 'Three Founding Canons'—one of stone, one of water, and one composed entirely of politely worded bureaucratic memoranda. Archaeological evidence suggests continuous habitation dating back to the late Neolithic period, although conclusive dating is hampered by the local tendency for artifacts buried deeper than $4$ meters to sp…
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Free Space Density Of States
Linked via "optical measurements"
$$\frac{A'}{A{21}} = \frac{\rho{\text{structured}}(\omega0)}{\rho{\text{FS}}(\omega_0)}$$
A notable finding in the mid-20th century, often cited in works on vacuum polarization (see Schwinger effect), is that the $\text{DOS}_{\text{FS}}$ exhibits a subtle, inherent asymmetry based on the observer's velocity relative to the cosmic microwave background (CMB) rest frame. While the standard formula above is Lorentz invariant for macroscopic calculations, cer… -
Hydrogen Bonding
Linked via "optical measurements"
Direct measurement of the hydrogen bond dissociation energy (HBDE)/) requires ultra-fast spectroscopic techniques. Time-resolved photoelectron spectroscopy (TRPS)/) coupled with tunable femtosecond lasers is standard. However, accurately isolating the vibrational stretch associated with the $\text{X}-\text{H}$ bond from the broader [solvent reorganization energy](/entries/s…
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Refractive Index Variance
Linked via "optical measurement"
In systems near a critical point) (e.g., the critical point) of a liquid-gas transition), density fluctuations occur across all length scales, leading to critical opalescence. As the system approaches the critical temperature ($T_c$), the structure factor) $S(q)$ diverges at small [scattering vectors](/entries/scattering-vec…