Difference between revisions of "Variables and Constants"

Revision as of 15:32, 4 January 2010

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)

Symbol	Meaning
ε	extinction coefficient of a molecule
Φ	quantum yield
Ψ	wave function

Symbol	Meaning
μ	dipole moment (mu) measured in debyes
α	linear polarizability (alpha)
β	molecular first hyperpolarizability (microscopic) (beta)
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 Electooptic Cofficient Pockels Effect r~ 10^-12 – 1^—10 m/V
r₃₃	Electrooptic cofficient (chi 33)(FM= 1000 pm/V)
χ²	second-order nonlinear susceptiblity (first order hyperpolarizability) (macroscopic)
χ³	third-order nonlinear susceptiblity (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
φ_fl	Fluoresence 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
v_π	half-wave driving voltage

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

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 |&delta;
-|[[Two photo cross section]] measured in  Goppert-Mayer units (GM), with 1 GM=1×10<sup>-50</sup> cm<sup>4</sup> s molecules<sup>−1</sup> photon<sup>−1</sup> >100gm is high.)
+|[[Two-photon cross section]] measured in  Goppert-Mayer units (GM), with 1 GM=1×10<sup>-50</sup> cm<sup>4</sup> s molecules<sup>−1</sup> photon<sup>−1</sup> >100gm is high.)
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 |<i>r</i>