Continuous wave: Difference between revisions

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{{Unreferenced stub|auto=yes|date=December 2009}}
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In [[physics]], the '''Lyman-alpha line''', sometimes written as '''Ly-<math>\alpha</math> line''', is a [[spectral line]] of [[hydrogen]], or more generally of [[Hydrogen-like atom|one-electron ions]], in the [[Lyman series]], emitted when the [[electron]] falls from the <math>n = 2</math> orbital to the <math>n = 1</math> orbital, where ''n'' is the [[principal quantum number]]. In hydrogen, its [[wavelength]] of 1215.668 [[angstrom]]s (121.6 nm or 1.216 × 10<sup>−7 </sup>m), corresponding to a [[frequency]] of 2.47&nbsp;&times;&nbsp;10<sup>15</sup>&nbsp;hertz, places the Lyman-alpha line in the [[vacuum ultraviolet]] part of [[ultraviolet]] in the electromagnetic spectrum. Lyman-alpha astronomy must therefore ordinarily be carried out by satellite borne instruments.
 
Because of [[fine structure]] perturbations, the Lyman-alpha line splits into a doublet. Specifically, because of the electron's [[spin-orbit interaction]], the stationary eigenstates of the [[Perturbation theory (quantum mechanics)|perturbed]] [[Hamiltonian (quantum mechanics)|Hamiltonian]] must be labeled by the ''total'' [[Angular_momentum#Angular_momentum_in_quantum_mechanics|angular momentum]] ''j'' of the electron ([[spin (physics)|spin]] plus [[Azimuthal quantum number|orbital]]), not just the [[Azimuthal quantum number|orbital angular momentum]] <math>l</math>. In the <math>n = 2</math> orbital, there are two possible states, <math>j = 1/2</math> and <math>j = 3/2</math>, resulting in a spectral doublet. The <math>j = 3/2</math> state is of higher energy (less negative) and so is energetically farther from the <math>n = 1</math> orbital to which it is transitioning. Thus, the <math>j = 3/2</math> state is associated with the more energetic (shorter wavelength) spectral line in the doublet.
 
A K-alpha, or K<sub>α</sub>, line analogous to the Lyman-alpha line for hydrogen, occurs in the high-energy induced emission spectra of all chemical elements, since it results from the same electron transition as in hydrogen.  
 
The equation for prediction of the frequency of this line (usually in the X-ray range for heavier elements), uses the same base-frequency as Lyman-alpha, but multiplied by a (Z−1)<sup>2</sup> factor to account for differing atomic numbers (Z) between elements, and is expressed in [[Moseley's law]]. The Lyman-alpha line as included in the rest of the hydrogen Lyman spectral series, is most simply described by the {n,m} = {1,2...} solutions to the empirical [[Rydberg formula]] (the Lyman-alpha frequency is produced by multiplying the Rydberg frequency for the atomic mass of hydrogen, R<sub>M</sub> (see [[Rydberg constant]]), by a factor of 1/1 - 1/2<sup>2</sup> = 3/4). Empirically, the Rydberg equation is in turn modeled by the semi-classic [[Bohr model]] of the atom.
 
==See also==
*[[Lyman-alpha forest]]
*[[Lyman-alpha emitter]]
*[[Lyman-alpha blob]]
*[[Moseley's law]]
*[[Lyman series]]
*[[Bohr model]]
*[[Lyman-break galaxy]]
 
{{DEFAULTSORT:Lyman-Alpha Line}}
[[Category:Atomic physics]]
[[Category:Astronomical spectroscopy]]
 
 
{{Atomic-physics-stub}}

Latest revision as of 22:57, 3 October 2014

Checking weight on the scale is an simple means to keep track of progress whenever following an exercise regimen, however it is very not the most accurate measure of overall health. A better indicator of health plus progress is body fat percentage.

The average petite proportion for petite size clothes females caters for those under 5 foot and 4 inches. They have somewhat less broad shoulders plus one to 1 / 2 inch less broad from the misses' size for the bust, waist and hips measurements. Petite clothes for women have the sleeves and pant length usually half to an inch smaller whilst pant's inseam as well as skirt length two to 3 inches less.

I have always loved cycling even because a child. I got my husband a cycle for Valentine's Day. He not waist to height ratio utilized it and six months later I decided to place it to superior employ. So each morning following I loaded my kid into his school bus I would go cycling. I generally did between 3 to 5 kms every morning and came house.

I went back to the same clinic plus spoke to a different doctor- by which time, nodules had shown up on my neck and were very painful. How great to find out a little pill can solve all mysterious problems which hit me like a ton of bricks. True, I'll be taking it for the rest of my lifetime, nevertheless I reside a happy plus healthy existence.

Correctly undertaken, diesel tuning by remapping the ECU can make the engine run better, producing additional energy and torque. Take, by way of illustration, a late-model Audi with a 2.0 litre TDi engine and authentic energy output of 140 BHP. Remapping the ECU could possibly boost energy to 170 BHP and increase torque by 75 Nm. Of course, energy gains will fluctuate, based on the model in addition to engine specs. However, a 35% improvement in performance is feasible for many cars or trucks.

The risk of getting a stroke in the upcoming ten years is estimated based on the gender, blood pressure, smoking status plus in the event you have diabetes.

This was a short bit of information in regards to the fat for women by height. The body mass index (BMI) is another advantageous method of calculating your ideal fat range by height.

I was born in Utah United States; my parents loves to cook food, thus I enrolled at culinary school at The Arts of Institutes main in baking and pastry. I employed inside among the right hotels in the city, however, later decided to establish my own company. We absolutely have more than 15 people inside the business and it's growing thus far. I enjoyed functioning with my team plus focus on improving more.I love to spend my time with my family or doing several exterior escapades like hiking.

In case you have virtually any queries with regards to exactly where along with how you can make use of waist height ratio, you possibly can contact us in our web-site.

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