Forced radiation

In article “Spontaneous emission.” i described that this emission occurs for internal reasons. The external influence forms the state of the atom so that the atom in this state can be for some time after the end of the external influence on it.

The duration of such a quasi-stationary state can be different. It all depends on the substance and external influences. But after the end of this time, the atom will necessarily emit a photon without any influence and will pass into another more stable state.

Stimulated (induced) radiation, in contrast to spontaneous, occurs under the influence of an external force and is carried out during this exposure.

How is stimulated emission carried out? The figure shows how an exchange photon works in an atom.

In position 1, the electron emits an exchange photon, which is reflected from the nucleus at the point o , along the line oa moves to the electron, is absorbed by it and slows down the electron, which will now move to the nucleus. This is all described in the article “The atom, its quantum device.”.

From position 2 to position 4 the electron moves for some time and, if we assume that the exchange photon will arrive strictly at the point а, then in the sector from the position of the electron at 4a there will be no spontaneous emission until the position 4b. But as soon as the electron is late to reach the position or flies over the position , while the photon is at the point а, it is obvious that the photon will not come into contact with the electron and will be emitted from the atom.

Obviously, it is worth holding the electron to position or accelerating its movement to position point a will go beyond the effective cross section of the electron, and the atom will emit a photon. And it does not matter in what position the point а was relative to the electron - the radiation will occur.

How can you delay or accelerate the movement of an electron? At this time, almost no one doubts that the photon has momentum. Naturally, it can transfer its momentum to an electron. This means that it can accelerate or slow down the movement of an electron. Moreover, in the retransmission mode, when the photon is absorbed, the electron either accelerates or slows down (not resonant gravity), and then if the photon is not resonant for a given state of the electron, it will be emitted with the same energy and the processes of acceleration or deceleration will change places and the electron will remain in the same state ...

If such a retransmission occurs in the section of the electron movement from position 2 to position 4, then this will not affect the state of the atom in any way. But when the mode of deceleration or acceleration of an electron falls at the beginning of section 2-3 or at the end of section 3-4, the electron may be delayed until the exchange photon appears at the point а or pass this point. As a result, the photon does not interact with the electron and is emitted from the atom. Forced emission will occur. As a result, the atom will change to a different state.

As you can see, as a result of this process, we have one photon at the entrance to the atom, and two photons at the exit.

It should be noted that by accelerating or slowing down the time of the electron's motion, we can not only provoke the induced radiation, but also slow it down, that is, extend the life of the excited state of the atom. In other words, to prevent the electron from crawling away from the trajectory of the exchange photon. To do this, you just need to change the accelerating or decelerating force to the opposite.

Is it possible to confirm the presented model with some experimental data? Yes. For example, laser and maser, which will be discussed in another article.

And even more interesting are the experiments of S. Arosh. I read about them in the article “Controlling photons in a box and exploring the quantum to classical boundary”.

The purpose of the experiment is noble and very necessary - in practice it is the counting of the number of photons without destroying them and, accordingly, the production of their quantity and, possibly, quality.

If agrees with the stated model of the atom and the stimulated emission, then it becomes clear how the photon in the photon box transfers the excited state of the atom to a stationary state without self-destruction or disappearance. On the contrary, the presence of such experimental results confirms the high probability of the objective reality of the proposed model of the atom and the process of induced radiation.

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