In a word infrared spectra is in order for the absorption of the synchronized molecular frequency of waves of light to take place. Next we would like to give a simple explanation about why molecules absorb light. We would like to start with the example of a molecule which has two atoms bound together. Each atom (considered to be perfect elasticity) has its own mass which is bound by a spring (molecular binding). This spring then expands and contracts. The molecular binding of normal frequency of oscillation frequency, to give a rough explanation, is the assumption that energy of the absorption band will be generated from the oscillation of this ideal atom harmonic oscillator. Then this becomes the T cycle of the simple harmonic motion of the spring. The frequency, where k is the force constant, µ is the reduced mass, and the bonded atomic mass is m1 and m2 gives µ=m1 x m2/(m1+M2). The wave number can be looked for from the frequency in vacuo at the velocity of light c.

That is the proper of the wave frequency can be known from the merging of the atomic mass. If the simplification of the above mentioned two atoms is considered, other atom molecule spacing, atoms close by, the electron acceptance and electron supply of atom groups, and the length and strength of molecular binding have influences on the spectra which makes it difficult to have a numerical formula which covers everything. The atomic clouds of the two atoms bound together in the actual molecules limit the access of the two atomic nucleus in a shrinkage process and an energy barrier is generated. In the chemical bonding extension process if the extension energy level reaches the disassociation energy then the chemical bonding is broken. Fig. 1 displays an energy diagram of the molecular space. At a smaller distance barriers suddenly increase and the extension of the pole of the barrier slowly becomes 0. Comparing it with the broken line of harmonic oscillator you can see that the anharmonic oscillator energy level is not equal. In addition the number of molecular vibration energy levels is not infinite unlike the classical spring model. As quantum theory describes the jumping energy level, it comes away as a substitute for the continuity of the energy. When the matter is exposed to the light the molecules contained in the matter are exposed from the inside of the light. The jumping value of the difference of the energy level corresponds to the energy that the light absorbs (frequency: only). The ground state energy level (Eg) makes a transition to excitation state energy level (Ee). That is to say the only the light with the corresponding value is absorbed when the molecules are



The reason for the IR-150's alternative gas correction
Infrared property absorption band internal -C-H stretching vibration standard vibrations from 2960~2850 cm-1 (3.38~3.51) appear as if they are near the absorption spectra. Like the bonding molecule range expressed on the previous page, the frequency is decided from the bonding state and has the proper spectra absorption. The IR-150 uses C3H8 as calibration gas. It must be possible to generate a stable concentration in order to easily replicate well in order for the C-H to bind in the molecular configuration of C3H8.

For the non-dispersive infrared analizer method measuring equipment if the absorption volume is set at a fixed standard with precision the equipment can supply without having any equipment difference. If the specified wave range absorbance total is done exactly the IR-150 will be put it in the exact place. Next the absorbance and concentration and gas types of the infrared radiation absorption join together. For the operation that the concentration demands the initial light volume must be based on Lambert-Beer and the function of the volume of light after the absorption will be an axis for a general light absorbing analysis.