Chapter 9, Problem 9E.1BE

(i)

Interpretation Introduction

Interpretation:

The secular determinant for linear ${\text{H}}_4$ is within the Huckel approximation has to be stated.

Concept introduction:

The rules of Hückel approximation are listed below.

• The non-overlap integrals which are represented as diagonal elements are to be equal to $\alpha -E$.
• The rest of the integrals which are represented as off-diagonal elements between neighboring atoms are to be equal to $\beta$.
• The overlap integrals are to be equal to zero.

(ii)

Interpretation Introduction

Interpretation:

The secular determinant for cyclic ${\text{H}}_4$ is within the Huckel approximation has to be stated.

Concept introduction:

The rules of Hückel approximation are listed below.

• The non-overlap integrals which are represented as diagonal elements are to be equal to $\alpha -E$.
• The rest of the integrals which are represented as off-diagonal elements between neighboring atoms are to be equal to $\beta$.
• The overlap integrals are to be equal to zero.