Principles of Instrumental Analysis
Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
Question
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Chapter 15, Problem 15.2QAP
Interpretation Introduction

(a)

Interpretation:

The meaning of fluorescence is to be stated.

Concept introduction:

When a substance absorbs radiation or light, it may emit or reflect it back.

Interpretation Introduction

(b)

Interpretation:

The meaning of phosphorescence is to be stated.

Concept introduction:

When a substance absorbs radiation or light, it may or may not emit it back.

Interpretation Introduction

(c)

Interpretation:

The meaning of resonance fluorescence is to be stated.

Concept introduction:

The atom can interact with fields of same frequency as them.

Interpretation Introduction

(d)

Interpretation:

The meaning of singlet state is to be stated.

Concept introduction:

There are magnetic spins on electrons in an atom. The magnetic spin can either be positive or negative.

Interpretation Introduction

(e)

Interpretation:

The meaning of triplet state is to be stated.

Concept introduction:

There are negative and positive magnetic spins on each electron in an atom.

Interpretation Introduction

(f)

Interpretation:

The meaning of vibrational relaxation is to be stated.

Concept introduction:

When a substance absorbs radiation or light, the molecules get excited. Then the energy is reflected back after some time.

Interpretation Introduction

(g)

Interpretation:

The meaning of internal conversion is to be stated.

Concept introduction:

The molecules get to the excited state by absorbing energy and come back to ground state by emitting this energy.

Interpretation Introduction

(h)

Interpretation:

The meaning of external conversion is to be stated.

Concept introduction:

The molecules get to the excited state by absorbing radiation and come back to ground state by emitting this radiation.

Interpretation Introduction

(i)

Interpretation:

The meaning of intersystem crossing is to be stated.

Concept introduction:

There is a possibility of changing states from singlet state to triplet state. It is only possible when spin orbit coupling is present.

Interpretation Introduction

(j)

Interpretation:

The meaning of predissociation is to be stated.

Concept introduction:

The bond of any molecule can be broken due to its unstable excited state.

Interpretation Introduction

(k)

Interpretation:

The meaning of dissociation is to be stated.

Concept introduction:

The bond of any molecule can be broken due to excessive absorption of energy.

Interpretation Introduction

(l)

Interpretation:

The meaning of quantum yield is to be stated.

Concept introduction:

The numbers of photons absorbed and emitted are different. These numbers are needed to find the yield of a substance.

Interpretation Introduction

(m)

Interpretation:

The meaning of chemiluminescence is to be stated.

Concept introduction:

The light that is absorbed by the molecules of a substance can be emitted because of different ways.

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Students have asked these similar questions
Vibration-rotation transitions in the infrared spectrum of 1H19F were observed at 2886.50, 2908.51, 2930.43, 2974.55, 2996.57, 3018.58 cm-1. (a) By considering the separations between pairs of lines. (b) Determine the bond length of 1H19F.
c) In a horizontal radiationless transition, the extent of overlap of the lu functions (probability distribution) of the initial and final states is the primary factor controlling the rate of internal conversion and intersystem crossing. Molecule (a) and molecule (c) of Figure 2 show the v = 0 vibrational level of the initial electronic state and v 7 vibrational level of the final state. Molecule (b) of Figure 2 shows the v= 0 vibrational level of the initial state and thev =1 vibrational level of the final state. Which one of the molecules (a), (b) or (c)) displays the strongest fluorescence? Explain your answer. (a) (b) (c) Figure 2: Overlap of the lyf functions for a radiationless transition between the initial (i) and finál (f) electronie states.
Calculate the ratio A/B for transitions with the following characteristics: (i) 500 MHz radiofrequency radiation, (ii) 3.0 cm microwave radiation.
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