64-311/5: Atomic and Molecular Spectra
... “Translate” the state labels listed below, in spectroscopic notation, into three quantum numbers, L, S and J. Which of these states correspond to possible values of L, S and J for a one-electron atom? For each rejected set (L, S, J) give at least one reason why it cannot be realised. 2S1/2; 2D1/2; 2 ...
... “Translate” the state labels listed below, in spectroscopic notation, into three quantum numbers, L, S and J. Which of these states correspond to possible values of L, S and J for a one-electron atom? For each rejected set (L, S, J) give at least one reason why it cannot be realised. 2S1/2; 2D1/2; 2 ...
Title of the communication (Times new Roman 16 bold
... Femtosecond absorption spectroscopy (left) reveals three kinetic processes. The excited state of NBA decays within 0.5 ps, an intermediate I has a lifetime of 70 ps and an intermediate II vanishes in ~ 2 ns. Addition of water reduces the lifetime of the intermediate I but does not affect the other p ...
... Femtosecond absorption spectroscopy (left) reveals three kinetic processes. The excited state of NBA decays within 0.5 ps, an intermediate I has a lifetime of 70 ps and an intermediate II vanishes in ~ 2 ns. Addition of water reduces the lifetime of the intermediate I but does not affect the other p ...
repeat
... For each of the molecules shown below, indicate on the diagram itself, in the space provided next to each group attached to the stereocentre, its priority, by writing the numbers 1, 2, 3, or 4 (1 being the highest and 4 the lowest priority). Then indicate whether the configuration of the stereocentr ...
... For each of the molecules shown below, indicate on the diagram itself, in the space provided next to each group attached to the stereocentre, its priority, by writing the numbers 1, 2, 3, or 4 (1 being the highest and 4 the lowest priority). Then indicate whether the configuration of the stereocentr ...
Nuclear Physics I (PHY 551) Lecture 24:
... - the observed concentration of excitation strength at E ~ 10’s of MeV. They originate from collective excitation of nucleons. The total value and distribution width much larger than typical resonances ...
... - the observed concentration of excitation strength at E ~ 10’s of MeV. They originate from collective excitation of nucleons. The total value and distribution width much larger than typical resonances ...
Name
... 42. A uniform bridge span weighs 50 x 103 N and is 40.0 m long. An automobile weighing 15 x 103 N is parked with its center of gravity located 12.0 m from the right pier. What upward support force is provided by the left pier? 43. A child wants to use a 10 kg board that is 3.5 m long as a seesaw. S ...
... 42. A uniform bridge span weighs 50 x 103 N and is 40.0 m long. An automobile weighing 15 x 103 N is parked with its center of gravity located 12.0 m from the right pier. What upward support force is provided by the left pier? 43. A child wants to use a 10 kg board that is 3.5 m long as a seesaw. S ...
Rotational spectroscopy
Rotational spectroscopy is concerned with the measurement of the energies of transitions between quantized rotational states of molecules in the gas phase. The spectra of polar molecules can be measured in absorption or emission by microwave spectroscopy or by far infrared spectroscopy. The rotational spectra of non-polar molecules cannot be observed by those methods, but can be observed and measured by Raman spectroscopy. Rotational spectroscopy is sometimes referred to as pure rotational spectroscopy to distinguish it from rotational-vibrational spectroscopy where changes in rotational energy occur together with changes in vibrational energy, and also from ro-vibronic spectroscopy (or just vibronic spectroscopy) where rotational, vibrational and electronic energy changes occur simultaneously.For rotational spectroscopy, molecules are classified according to symmetry into spherical top, linear and symmetric top; analytical expressions can be derived for the rotational energy terms of these molecules. Analytical expressions can be derived for the fourth category, asymmetric top, for rotational levels up to J=3, but higher energy levels need to be determined using numerical methods. The rotational energies are derived theoretically by considering the molecules to be rigid rotors and then applying extra terms to account for centrifugal distortion, fine structure, hyperfine structure and Coriolis coupling. Fitting the spectra to the theoretical expressions gives numerical values of the angular moments of inertia from which very precise values of molecular bond lengths and angles can be derived in favorable cases. In the presence of an electrostatic field there is Stark splitting which allows molecular electric dipole moments to be determined.An important application of rotational spectroscopy is in exploration of the chemical composition of the interstellar medium using radio telescopes.