Krypton wavelength

The efficiency of a helium—neon laser is improved by substituting helium-3 for helium-4, and its maximum gain curve can be shifted by varying the neon isotopic concentrations (4). More than 80 wavelengths have been reported for pulsed lasers and 24 for continuous-wave lasers using argon, krypton, and xenon lasing media (111) (see Lasers). 

In order to increase the precision of realization of the base unit meter, the definition based on the wavelength of a krypton-86 radiation was replaced in 1983 by one based on the speed of light. Also added were the prefixes zetta (Z) for 10, zepto (z) for 10 , yotta (Y) for 10 , and yocto (y) for 10 . 

This definition, adopted in 1983 by the 17th CGPM, superseded the definition based on the wavelength of a krypton-86 radiation. 

In 1960, the SI unit of length was redefined. While keeping the metre as the unit of length, it is now defined as 1 650763.73 wavelengths of the light emitted in vacuo by krypton-86. This is a sensible standard, because it can be reproduced in any laboratory in the world. 

The frequency stability obtained up to now is already better than 1x10 and therefore exceeds the accuracy of the optical wavelength standard (red krypton line) by more than three orders of magnitude 333b, c)... 

Since 1960 the wavelength of the spectral lines of the krypton-86 isotope has been used as the standard for the length of the meter. One meter is now defined as 1,650,762.73 wavelengths of the reddish-orange spectral line of the Kr-86 isotope. 

The ADF has been measured in deoxygenated solutions with continuous excitation of either argon, krypton or helium-neon lasers. The exciting wavelengths corresponded to the bands of Sq > 1 metalloporphyrin absorption (excitation wavelengths Xex = 514.5 530.9 568.2 nm for ZnTPP and Xex = 568.2 632.8 nm for ZnTBP and CdTBP). 

Meter (metre) (preferred spelling in U.S. is meter) m 1650763.73 wavelengths in vacuum of the orange-red line of the spectrum of krypton-86... 

Dyakin VM, Skobelev IYu, Faenov AYa, Bartnik A, Fiedorowicz H, Szczurek M, Osterheld A, Nilsen J (1997) Precision measurements of the wavelengths of spectral lines of multiply charged krypton and argon ions formed in a gas target heated by laser radiation. Quantum Electron. 27 691-695... 

The meter is the length equal to 1650763.73 wavelengths in vacuum of the radiation corresponding to the transition between the levels 2p10 and 5ds of the krypton-86 atom. 

Shown in Fig. 7.9 is the 2-3 spectrum of neon-like krypton (Kr26+), with satellites [36] previous observations can be found in [8,28,37,38]. This is a composite spectrum obtained by scanning in wavelength during a sequence of reproducible Alcator C discharges [36], with a peak electron density of... 

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