Helium emission spectrum. How strange that a substance that did not form mol- ecules could be found inside so many minerals.8 How did it get inside these minerals, if it does not like to bond with anything? Why was this chemically useless element found in radioactive minerals? Was the ...
The calibration spectrum has a maximum value of 10 at 200 kHz and decreases approximately logarithmically with increasing frequency to about 0.2 at 0.8 MHz. Comparison of a detected voltage spectrum for an acoustic emission event with the helium gas jet system spectrum permits the displacement ...
Comparing with the spectra of K*Hen, we found that the infrared emission spectrum of the K atom excited in liquid He was from K*He6. To confirm the assignment, we have also carried out ab initio calculation of adiabatic potential curves and peak positions of the emission spectra of the ...
Lockyer explained its origin by the presence in the sun of a new element, which was named helium (from the Greekhelios, “Sun”). On earth, helium was isolated for the first time by the Englishman W. Ramsay from the radioactive mineral cleveite. The spectrum of the gas evolved upon hea...
10. ^ Ramsay, William (1895). "On a Gas Showing the Spectrum of Helium, the Reputed Cause of D3 , One of the Lines in the Coronal Spectrum. Preliminary Note". Proceedings of the Royal Society of London 58: 65–67. doi:10.1098/rspl.1895.0006. ...
(1994) reported a flux cutoff shortward of redshifted He II Ly α : emission in the HST prism spectrum of the quasar 0302–003 ( z = 3.286), with the optical depth -1.0+∞ . The spectrum of quasar HS1700+64 ( z = 2.743) recently obtained with the Hopkins Ultraviolet Telescope (...
the dark lines that Fraunhofer had discovered represented light being absorbed by a cooler element at the surface of the sun. “The two scientists found that every chemical element produces a unique spectrum,” theAmerican Institute of Physicswrites. “This provides a sort of ‘fingerprint’ which...
Earth in 1895. Ramsay obtained a sample of theuranium-bearing mineral cleveite, and, upon investigating the gas produced by heating the sample, he found that a unique bright yellow line in its spectrum matched that of the D3line observed in the spectrum of the Sun; the new element of ...
The transition X-rays are detected using two high-resolution crystal spectrometers placed at observation angles of θ = ±90° near the gas-target chamber, on the inner and outer sides of the storage ring (Fig. 1), and equipped with X-ray charge-coupled devices (CCDs) as position-...
For the solid line an NSE distribution has been assumed for the matter composition; the dashed line shows the spectrum if heavy nuclei (with A>100) are neglected in the distribution. The dotted curve shows the spectra if screening corrections due to the astrophysical environment are not ...