(1) Which more closely resembles an absorption spectrum,an emission or an excitation spectrum?(2) What is the difference between fluorescence andphosphorescence?(3) Define quantum yield?

(1) Which more closely resembles an absorption spectrum, an emission or an excitation spectrum?An…

Answered: (1) Which more closely resembles an…

Physical Chemistry

2nd Edition

ISBN:9781133958437

Author:Ball, David W. (david Warren), BAER, Tomas

Publisher:Ball, David W. (david Warren), BAER, Tomas

Chapter15: Introduction To Electronic Spectroscopy And Structure

Section: Chapter Questions

Problem 15.60E

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In high-temperature sources, sodium atoms emit a doublet with an average wavelength of 1139 nm. The transition responsible is from the 4s to 3p state. Set up a spreadsheet to calculate the ratio of the numberof excited atoms in the 4s state to the number in the ground 3s state over the temperature range from anacetylene-oxygen flame (3000°C) to the hottest part of an inductively coupled plasma source (8750°C).
Sound waves, like light waves, can interfere with each other, giving maximum and minimum levels of sound. Suppose a listener standing directly between two loudspeakers hears the same tone being emitted from both. This listener observes that when one of the speakers ismoved 0.16 m farther away, the perceived intensity of thetone decreases from a maximum to a minimum.(a) Calculate the wavelength of the sound.(b) Calculate its frequency, using 343 m s-1as the speedof sound.
An aqueous solution of chloroethanoic acid at 25oC is irradiated with light of wavelength 253.7 nm. As a consequence, a photochemical reaction occurs where 2-hydroxyethanoic acid and hydrogen chloride are obtained. It is observed that when 34.37 J are absorbed, 2.325·10-5 moles of chlorine ion are formed. a) Wwtermine the number of Einsteins absorbed c) calculate the quantum yield of the reaction.
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Calculate the momentum of an X-ray photon with a wavelength of 0.17nm. How does this value compare with the momentum of a free electron that has been accelerated through a potential difference of 5000 volts? (Hint: electron mass, m, = 9.10938 x 10" kg; electron charge e = 1.602 x 10"C; speed of light e = 3.0 x 10* m.s'; 1.00 J= 1.00 VC; h = 6.626 x 10"J.s. The various energy units are: 1 J= 1 kg.m°s³, 1.00 eV =1VC, leV= 1.602 x 10"J, 1J= 6.242 x 10" eV, etc.). %3D
The vibrational frequency of the hydrogen chloride HCl diatomic molecule is 8.97 x 1013Hz. chloride atom is 35.5 times more massive than hydrogen atom. (mµ = 1.67 x 0-27kg,c = 3.0 x 10°m/s) a) What is the force constant of the molecular bond between the hydrogen and the chloride atoms? b) What is the energy of the emitted photon when this molecule makes a transition between adjacent vibrational energy levels? c) What is the wavelength of the emitted photon? d) The possible wavelengths of photons emitted with the HCl molecule decays from the 2nd excited state eventually to the ground state(0 state).
The first excited state of Ca is reached by absorption of 422.7-nm light. (a) What is the energy difference (J) between the ground and excited states? (b) The degeneracies are g*/g0 3 for Ca. Find N*/N0 at 2 500 K. (c) By what percentage will the fraction in (b) be changed by a 15-K rise in temperature? (d) Find N*/N0 at 6 000 K.
Define the term Frequency Factor?
Explain the difference between the excitation and emission spectra of a molecule such as anthracene.
We have a HCl molecule, with H and Cl have atomic mass of 1.0 and 35.5 amu, respectively. The force constant is 480 N/m for this H-Cl bond, what is the photon frequency when the HCl molecule decay from its second excited vibrational state to its ground vibrational state?
3. Regions of the electromagnetic (e/m) spectrum and corresponding molecular processes. (a) Sketch the e/m spectrum like depicted in figure below. For your sketch, use the following units (all together in one plot): wavelength, frequency, wavenumbers, and energy. (b) What are the molecular processes that can be studied by the different types of e/m radiation? Name three (3) processes. (A) Radio waves (B) Micro- waves (C) (D) Infrared Visible radiation light Ultraviolet m X-rays (F) Gamma-rays

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(1) Which more closely resembles an absorption spectrum, an emission or an excitation spectrum? (2) What is the difference between fluorescence and phosphorescence? (3) Define quantum yield?