# Test 4

 T (transmittance) I/I0 Absorbance (Trans deffinition) A=-log(T) Absorption (lambert beer) Energy of a Rigid Rotor Rotational Constant (B) Formual that relates I to Energy Moment of Interia (I) Increase in energy between levels for Rotatational Transition 2(J+1)Bh Values of rotational quantum nubmer (J) Integers greater than 0 Relation between wavenumber and wavelength v What does spectroscopy measure Changes in Energy!!! What is energy spacing in change beteen levels for sepctroscopy? 2 Bh Pauli Exclusion Principle No two electrons cannot share the same set of quantum numbers within the same system. Therefore, there is room for only two electrons in each spatial orbital. One of these electrons must have (for some chosen direction z), , and the other must have . Hunds law Favored configuration normally invovles maximum unpaired spin. Perturbation theory for hamiltonian \This implies that\ Energies relation to basic wave data E Wavelength to frequency relation cv What happens when light is absorbed Nothing visually, but atom is excited to higher energy level. What happens when atom moves to lower energy level? Atom relaxes to lower energy level and releases light. What type of energy change shown by spectrograph lines? Electronic Energy! Which region of energy spectrum does rotational energy correspond to? Microwave Which region of energyspectrum does electronic energy correspond tro? Visible Which energy region does vibrational energy correspond to? Infared Where is rigid rotor model important? In rotating atoms What is classical momentum modelled after (P) mass* velocity What is rotational momentum (p) modelled after? Moment of inertia* rotational velocity = Iw What is formula and deffinition of reduced mass (\)? \ What are two quantum numbers associated with rigid rotor wave functions adn what are their possible values? l=angular momentum quantum number = integer 0 or greatermi =magnetic number =integer beteen -l (angular moment) and l(angular moment) Which quantum number does the energy of rigid momentum depend on? l (angular) What is degeneracy of rigid momentum energy levels depend on? 2 (angularm momentum)+ 1 Quantum energy for harmonic oscilator? At E0 it simplifies to ) What are allowable energy levels (v) for the harmonic oscilator function_) integers of 0 or greater What is order of energy needed for transitions of different tyeps Rotational