Variables and Constants
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Return to Acronyms and Unit Abbreviations Menu |
Common
Symbol | Meaning |
---|---|
c | speed of light (c = 299,792,458 m/s approx 3 x 106m/s) |
ν | frequency |
h | planck's constant (h = 6.62606896x 10-34 J s = 4.135667 x 10-15eV s) |
λ | wavelength (visible spectrum is 400-700nm) |
Absorption and Emission
Symbol | Meaning |
---|---|
ε | extinction coefficient of a molecule |
Φ | quantum yield |
Ψ | wave function |
EO Properties
Symbol | Meaning |
---|---|
μ | dipole moment (mu) measured in debyes |
α | linear polarizability (alpha) |
β | molecular first hyperpolarizability (microscopic) (beta) |
γ | molecular second hyperpolarizability (microscopic) (gamma) |
cos3θ | order parameter |
δ | Two-photon cross section measured in Goppert-Mayer units (GM), with 1 GM=1×10-50 cm4 s molecules−1 photon−1 >100gm is high.) |
r | Pockels coefficient or Linear Electo-optic Coefficient Pockels Effect r~ 10-12 – 1—10 m/V |
r33 | Electro-optic coefficient (chi 33)(FM= 1000 pm/V) |
χ2 | second-order nonlinear susceptibility (first order hyperpolarizability) (macroscopic) |
χ3 | third-order nonlinear susceptibility (second order hyperpolarizability) (macroscopic) (alpha)(FM= 6-7 x 10-21(m/V)2) |
ε | dielectric constant or relative static permittivity |
M | Transition dipole moment (measured in debyes) |
N | Number Density parameter |
φfl | Fluorescence Quantum Yield a ratio of photons absorbed over photons emitted |
σ | conductivity (measured in S (Siemens)/cm |
t | the electronic coupling, transfer integral or resonance integral |
vπ | half-wave driving voltage |
Devices
Symbol | Meaning |
---|---|
α | material loss in dB/cm |
d | electrode separation |
Γ | optical electrical overlap |
λ | reorganization energy |
μ | charge mobility in cm2 / V s- a mobility >1 is considered good |
see also Wikipedia Greek Letters in Science