D2 ATOMIC - EXPERIMENT ATOMIC SPECTROSCOPY Introduction The elements are characterized by the nature of the electromagnetic radiation that each can

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
EXPERIMENT ATOMIC SPECTROSCOPY Introduction: The elements are characterized by the nature of the electromagnetic radiation that each can emit or absorb. A particular element cam emit light (or X -ray, gamma rays, …etc) of only certain wavelengths that make up the spectrum characteristic of that element. For example, the hydrogen spectrum consists of wavelengths given by the formula = 2 2 1 1 1 n m R λ (1) where m and n are integers ( n > m ) and R = 1.097 × 10 7 m 1 is called the Rydberg constant. The set of wavelengths which correspond to m = 2 is called the Balmer series. Therefore, Balmer series : = 2 1 4 1 1 n R , n > 2 i.e. n = 3, 4, 5, … (2) These wavelengths lie in the visible part of the spectrum. Spectra can be observed and measured by means of an instrument called a prism spectrometer shown in Fig.1. prism telescope collimator image focus slit adjust crosshair focus prism table locking screw telescope locking screw telescope fine adjust rotating dial locking screw Figure 1: Prism Spectrometer The spectrometer is an optical instrument for analyzing spectra. Light enters the collimator and is dispersed into a spectrum by the prism. It is then brought to a focus by the telescope. Monochromatic
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 light will produce a single image of the collimator slit; if the source consists of several wavelengths, then a corresponding number of colored lines will be produced. The resulting spectrum is characteristic of a particular element. No two elements will exhibit the same pattern of lines. In this experiment, light from a source such as an arc lamp, gas discharge tube, or the sun, shines into a slit at the end of the
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/01/2011 for the course PHY 135 taught by Professor Wagihghobriel during the Spring '11 term at University of Toronto- Toronto.

Page1 / 4

D2 ATOMIC - EXPERIMENT ATOMIC SPECTROSCOPY Introduction The elements are characterized by the nature of the electromagnetic radiation that each can

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online