Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Question
Chapter 8, Problem 8.3QAP
Interpretation Introduction
Interpretation:
In atomic spectroscopy, conditions for occurrence of Stokes shift is to be explained.
Concept introduction:
Explanation of different conditions for Stokes shift is done by understanding the concept of Stokes shift.
Stokes shift can be described by the difference of maxima of absorption and emission of transition of an electron.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Alexa Fluor 568 is a fluorescent dye that in aqueous solution displays a
maximum absorbance at 576 nm, a quantum yield of 0.69, a lifetime of 3.60 ns
and a Stokes shift of 24 nm.
(i) Show a schematic of a typical fluorimeter and its main components.
Briefly explain the role of each component.
(ii) Explain what is the "Stokes shift" and what physical processes underpin
the observation of such shifts; use diagrams and/or equations as
appropriate in your explanation.
(iii) Calculate the radiative decay constant of Alexa Fluor 568.
What is the Doppler-shifted wavelength of a red (680 nm) traffic light approached at 60 km h−1?
What is the significance of the max of a
spectrum?
What are the other uses of the
spectrophotometer?
Chapter 8 Solutions
Principles of Instrumental Analysis
Knowledge Booster
Similar questions
- 2. Peaks resulting transitions from n → TT* are shifted to shorter wavelengths (blue shift) with an increasing of solvent polarity. * True Falsearrow_forwardA proton jumps between two sites with δ = 2.7 and δ = 4.8. At what rate of interconversion will the two signals collapse to a single line in a spectrometer operating at 550 MHz?arrow_forwardSuppose that the wavenumber of the J = 1 ← 0 rotational transition of 1H79Br considered as a rigid rotor was measured to be 17.89 cm-1, what is(a) the moment of inertia of the molecule? ______ kg-m2(b) the bond length? ______ Angstroms(Given the isotopic masses:(m(79Br) = 78.9183 amu, m(81Br) = 80.9163 amu)arrow_forward
- The magnetogyric ratio of 19F is 2.5177 x 108 T-1 s-1. Calculate the frequency of the nuclear transition in a field of 7.500 T.arrow_forwardWhen a sample of 4-heptanone was irradiated for 100 sec with 313 nm radiation with a power output of 50 W under conditions of total absorption, it was found that 2.8 mmole C2H4 was formed. What is the quantum yield for the formation of ethane?arrow_forward5arrow_forward
- 0.8 0.6 0.4 0.2 0.0 3000 2000 1000 Wavenumber (cm-1) ОН NH2 `NH2 A В C Transmitancearrow_forwardThe wavenumber of the incident radiation in a Ramanspectrometer is 20 623 em·'. What is the wavenumber of thescattered Stokes radiation for the J = 4 ~ 2 transition of 160 2?arrow_forwardIdentify and provide an explanation of the operational principles behind an Atomic Absorption Spectrometer.arrow_forward
- If two signals differ by 1.5 ppm in a 300 MHz spectrometer, by how much do they differ in a 500 MHz spectrometer?arrow_forwardThe collision frequency z of a molecule of mass m in a gas at a pressure p is z = 4σ(kT/πm)1/2p/kT, where σ is the collision cross-section. Find an expression for the collision-limited lifetime of an excited state assuming that every collision is effective. Estimate the width of a rotational transition at 63.56 cm−1 in HCl (σ = 0.30 nm2) at 25 °C and 1.0 atm. To what value must the pressure of the gas be reduced in order to ensure that collision broadening is less important than Doppler broadening?arrow_forwardThe first three absorption lines in the pure rotational spec- trum of gaseous 12C16O are found to have the frequencies 1.15 x 1011, 2.30 × 1011, and 3.46 × 1011 s-1. Calculate: (a) The moment of inertia I of CO (in kg m²) (b) The energies of the J = 1, J = 2, and J = 3 rotational levels of CO, measured from the J = 0 state (in joules) (c) The C-O bond length (in angstroms)arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning