Spectra Definition and 285 Threads

I have tree files of IR spectra but I cann't open them, because I have no suitable software. I need to open them. does somebody knows some kind of freeware which I can use to open this files. or if somebody can I will send this files to open and copy them into MS Word and send them back to me...

I need help on this problem that asks me to solve for n_1 and n_2 (the initial and final quantum numbers). This is the given information (the line spectra for Hydrogen): color red known wavelength: 656.4 nm color turquoise known wavelength: 486.3 nm purple...

Can anyone send me a picture of graph absorption spectra of 2,3-dimethylindole? The graph should be accurate (from a spectrophotometer) Thanks

Hello there, if I have a impulse train as f(t) with a frequency of 100 khz, and cos(w_0*t) = g(t) with frequency of 10 khz, how do I go about determining the signal spectra, (i.e. harmonics n = 1,2,3...)? I determined the Fourier transform, but I get stuck as to what to do with it. :confused...

I was wondering why Henry Moseley ploted \sqrt{f} vs. Z instead of just f vs. Z. I'm guessing it is because this way, the graph of \sqrt{f} vs. Z would be linear? But if it was just f vs. Z, wouldn't the equation just be exponential? Also, what is the significance of the L seriese and the K...

In Sakurai: The state ket for an arbitrary physical state can be expanded in terms of the |x'> |\alpha>=\int dx'^3 |\mathbf{x'}><\mathbf{x'}|\alpha> (where the |x'> are the eigenkets of the position operator, \hat{x}|x'>=x'|x'>). (Sakurai 1.6.4, p. 42) My question is about how this integral is...

In L. I. Schiff book, one can follow his derivation of the Hamiltonian from Dirac relativistic equation and obtain the following.. \left[\frac{\vec{p}^2}{2m}+V-\frac{\hbar^2}{4m^{2}c^{2}}\frac{dV}{dr}\frac{\partial}{\partial r}+\frac{1}{2m^{2}c^{2}}\frac{1}{r}\frac{dV}{dr}\vec{S}\cdot...

Please check my solution and I need help on understanding the second part of the question. Q:Obtain the complex form of the Fourier series of the sawtooth function. f(t) = \frac{2t}{T} \ \ \ 0 < t < 2T\\ So if the period is 2l = 2T then l = T \\ c_n = \frac{1}{2l} \int_{-l}^{l} f(x) e^{in\pi...

i'm about to tear off all the hair on my head, learning about line spectra... i got the lyman,balmer and paschen series in my textbook and the formula for it. but how do i apply it in a physics question? like for example if i have an electron that is excited to the n = 6 state, which formula...

Why does neon have more spectral lines than helium? Is the atomic spectrum based on an element's electron configuration?

Hi! to everyone on the forum. I am new and did not really know where i should of posted this thread its not homework its just a question i have. A friend of mine asked me a question about a book he read about (atomic spectra and atomic structure by Gerhard Herzberg). Gerhard Herzberg said...

Hello, A friend of mine has synthesized a compound with pentafluorophenyl groups, and is willing to characterize it via an additional 19F-NMR. However, the person responsible for recording NMR spectra is inexperienced in 19F-NMR, so we need help on recording the spectra. We have...

Consider the Lyman photons for Hydrogen-like atoms with Z greater than one. Which of these atoms have Lyman alpha photons in the 1)visible 2)UV 3)X-ray and 4)gamma-ray parts of the spectrum? Can list ranges of values of Z in the answers. My thoughts are to use 1/lambda=...

Why don't stellar spectra show absorption lines for carbon, oxygen or nitrogen if they are such abundant elements. Is there a 'spectral type' that does? Thanks Dave

Hi all, i am studying the physics of Raman Spectra. Was able to understand the origin of Vibrational Raman Spectra... which was an effect due to the change of polarizability with internuclear distance due to molecular vibration. But, i still yet to figure out why rotation of molecules can...

Hi, i have a question, if we imaging that the universe is static and not expanding, what observation would be made in regards to red shifts in galaxy spectra?

just been learning how to produce x-rays by firing electrons at heavy atoms, but i am a tad confused about the x-ray spectra graph with 'intensity' on the y and 'wavelength' on the x. it shows that the minimum wavelenth is produced wen intensity=0. how is this possible?

An emission spectrum can contain wavelengths produced when an electron goes from the third to the second leve. So could you see this like in the absorption spectrum? Why?

Is it possible to see the radio spectra, X-ray, or microwave etc like birds can see the UV spectra? If so what might/does it look like? Thanks

I got a spectra I need to interpret. It is used to calculate the rotational speed of Jupiter. However, altough the computer indicates the doppler shift, I don't see anything (see photograph). I wonder if anyone could enlighten my stalled mind? :smile: I suppose when I figure out the...

Hello everyone. In the literature I come across spectra data as in the examples below: English example: 1H-NMR (CDCl3) δ: 1.09 (3H, t, CH3), 3.77 (3H, s, OCH3), 3.97-4.28 (2H, m, CH2), 4.28 (1H, s, CH) 6.41 (2H, t, pyrrole-H), 6.78 (2H, t, pyrrole-H), 7.13-7.21 (5H, m, ArH), 8.53 (1H, d...

I did a spectroscope experiment with a hydrogen discharge tube. So far I got this data: Line 1: Color=Red \lambda(nm)=700 \nu(Hz)=4.2*10^{14} n1=? n2=? \Delta{E}(J)=2.8*10^{-19} E(J)=? This is only the data for the Red line. I figured if i knew how to do this, I'll...

I don't know a whole lot about quantum mechanics and there is something that dosen't make sense to me. An atom absorbes radiation in only certin frequencies. Do these frequencies have to be exact? Can they vary over a small range like say 1.000 to 1.001 or do they have to be perfectly exact...

What are reflectance spectra and synchronous spectra? What are the difference and which information I can obtain from them ?

64. Electromagnetic radiation provides a means to probe aspects of the physical universe. Which of the following statements regarding radiation spectra is NOT correct? a. lines in the infaret, visible, and ultraviolet regions of the spectrum reveal primarily the nuclear structure of the...

When radiation with a continuous spectrum is passed through a volume of hydrogen gas whose atomes are all in the ground state, which spectral series will be present in the resulting absorption spectrum? Where do i even start?

I'm looking for data on "acoustic noise" produced regularly by the earth, nothing man-made. In particular I'm looking for noise sources outside of the normal range of human hearing (20Hz-20kHz). Of course there are numerous terrestial noise sources, such as earthquake tremors, but those aren't...

Can somebody explain quantum tunneling to me? And the thing about why amplitudes when they are trapped, the energies must choose from a distinct set of values? And why when particles that are totally free to wander will have any energy that they like? Also, why in the atomic spectra, more...

there is this one really good NMR spectra interpretation website out there... i think. i vaguely remember coming across one years ago. anybody know what I am talking about? anybody know the url?

Spectrum of a Rings So I think I'm finally getting the definition of a scheme, but the texts I'm using aren't exactly ripe with examples. So, I wanted to condier some ring spectra to construct examples... I played around with the simple examples Z and Z[x], and my next thought was to look at...

Let me see if I got this straight... The hydrogen spectra consists of a couple of series - Lyman, Balmer, Paschen, Brackett, etc - which all corresponds to a certain energy transition - Lyman (n>1 -> n=1), Balmer (n>2 -> n=2).. and so on... correct ? And since n=1 is the ground state, a...

Just a simple quickie, why are stars classified using the letters O, B, A, F, G, K and M? Is there any significance in the letters?

hello all i'm investigating the band gap of certain nanocrystallites in the powder form, using a Shimadzu spectrometer with the powder dissolved in ethanol. The spectra, however, come with several peaks in addition to the expected peak for absorption. This is not unexpected as transitions to...

We all know that Maxwell did such a great work for all physicist. BUT, anyone knows that how Maxwell's theory of radiation could not explain atomic spectra?

Hi, I need images of absorption and emission spectra for sodium to be used in a physics student book. Thanks in advance Stanley