= &
    \sqrt{\displaystyle\frac{1}{3}}
    \displaystyle\sum\limits_{\mu = \pm 1} \mu\, h_{\mu}
    \sum\limits_{\mu^{\prime} = \pm 1} (n, 1, l_{ph} \big|\, \mu-\mu^{\prime}, \mu^{\prime}, \mu) \;
    \displaystyle\int \:
      Y_{l_{f}m}^{*}({\mathbf n}_{r}^{f}) \,
      Y_{1,-\mu^{\prime}}(\mathbf{n}_{r}^{i}) \,
      Y_{n, \mu-\mu^{\prime}}^{*}(\mathbf{n}_{ph}) \;
      d\Omega, \\

  I_{E}(l_{f},l_{ph},n) & = &
    \sqrt{\displaystyle\frac{1}{3}}
    \displaystyle\sum\limits_{\mu = \pm 1} h_{\mu}
    \sum\limits_{\mu^{\prime} = \pm 1} (n, 1, l_{ph} \big|\, \mu-\mu^{\prime}, \mu^{\prime}, \mu) \;
    \displaystyle\int \:
      Y_{l_{f}m}^{*}({\mathbf n}_{r}^{f}) \,
      Y_{1,-\mu^{\prime}}(\mathbf{n}_{r}^{i}) \,
      Y_{n, \mu-\mu^{\prime}}^{*}(\mathbf{n}_{ph}) \;
      d\Omega.
\end{array}
\label{eq.2.4.12}$$

Calculations of the angular integrals \[sec.2.5\]
-------------------------------------------------

Let us analyze a physical sense of vectors $\mathbf{n}^{i}_{r}$, $\mathbf{n}^{f}_{r}$ and $\mathbf{n}_{ph}$. According to definition of wave functions $\psi_{i} (\mathbf{r})$ and $\psi_{f} (\mathbf{r})$, the vectors $\mathbf{n}^{i}_{r}$ and $\mathbf{n}^{f}_{r}$ determine orientation of radius-vector $\mathbf{r}$ from the center of frame system to point where this wave functions describes the particle before and after the emission of photon. Such description of the particle has a probabilistic sense and is fulfilled over whole space. Change of direction of motion (or tunneling) of the particle in result of the photon emission can be characterized by change of quantum numbers $l$ and $m$ in the angular wave function: $Y_{00}(\mathbf{n}^{i}_{r}) \to Y_{lm}(\mathbf{n}^{f}_{r})$ (which changes the probability of appearance of this particle along different directions, and angular asymmetry is appeared). The vector $\mathbf{n}_{ph}$ 