What Determines the Emission Line of He II at 468.6 nm?

This should give a reasonable answer for the transition wavelength. In summary, the emission line of He II at 468.6 nm corresponds to a transition from a 3s1 state to a 1s2 state, and the Rydberg's constant for helium is 18.898 cm-1. Using the formula 1 / λ = R(1/nb2 - 1/na2) with R = 18.898 cm-1 and assuming an initial energy state of 3s1 should give a reasonable answer for the transition wavelength.
  • #1
nsatya
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1. The emission line of He II at 468.6 nm corresponds to what electronic transition?

2. I know that the formula 1 / λ = R(1 / nb2 - 1/ na2) may be useful but I'm not sure how the Rydberg's constant would change since it's helium. Also, I'm not sure what to assume as the initial energy state.

3. I first tried to use the same value for R as it is for hydrogen, but it did not seem to give a reasonable answer. Any help would be greatly appreciated. Thanks!
 
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  • #2
The emission line of He II at 468.6 nm corresponds to the transition from a 3s1 state to a 1s2 state. The Rydberg's constant for helium is different than that for hydrogen and is equal to 18.898 cm-1. Therefore, you can use the formula 1 / λ = R(1/nb2 - 1/na2), with R being equal to 18.898 cm-1 and assuming an initial energy state of 3s1.
 

FAQ: What Determines the Emission Line of He II at 468.6 nm?

What is an ionic spectrum for helium?

An ionic spectrum for helium refers to the specific wavelengths of light emitted or absorbed by helium ions when the element is excited. This spectrum is unique to helium and can be used to identify the presence of helium in a sample.

How is an ionic spectrum for helium produced?

An ionic spectrum for helium is produced when the element is heated or energized. This causes the electrons in the helium atoms to become excited and jump to higher energy levels. When these electrons return to their lower energy levels, they release energy in the form of light, which creates the characteristic spectrum.

What can an ionic spectrum for helium tell us about the element?

An ionic spectrum for helium can tell us about the energy levels of the electrons in the atom and their transitions between these levels. It can also provide information about the number of electrons in the helium ion and its overall electronic structure.

Why is an ionic spectrum for helium important?

An ionic spectrum for helium is important because it allows us to identify the presence of helium in a sample, which is useful in various fields such as astronomy, chemistry, and physics. It also helps us understand the behavior and properties of helium and other elements.

How is an ionic spectrum for helium different from other spectra?

An ionic spectrum for helium is different from other spectra because it is specific to helium and reveals information about the ionized form of the element. Other spectra, such as the atomic or molecular spectra, provide information about neutral atoms or molecules. Additionally, the wavelengths and intensity of the lines in an ionic spectrum for helium are unique to this element and cannot be found in other spectra.

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