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We present an observational study about the impacts of the interactions inthe electron density of \ion{H}{ii} regions located in 7 systems of interactinggalaxies. The data consist of long-slit spectra in the range 4400-7300 A,obtained with the Gemini Multi-Object Spectrograph at Gemini South (GMOS). Theelectron density was determined using the ratio of emission lines[SII]6716/6731. Our results indicate that the electron density estimatesobtained of HII regions from our sample of interacting galaxies aresystematically higher than those derived for isolated galaxies. The meanelectron density values of interacting galaxies are in the range of $N_{\rme}=24-532$\,$ \rm cm^{-3}$, while those obtained for isolated galaxies are inthe range of $N_{\rm e}=40-137\: \rm cm^{-3}$. Comparing the observed emissionlines with predictions of photoionization models, we verified that almost allthe \ion{H}{ii} regions of the galaxies AM\,1054A, AM\,2058B, and AM\,2306B,have emission lines excited by shock gas. For the remaining galaxies, only fewHII regions has emission lines excited by shocks, such as in AM\,2322B (1point), and AM\,2322A (4 points). No correlation is obtained between thepresence of shocks and electron densities. Indeed, the highest electron densityvalues found in our sample do not belong to the objects with gas shockexcitation. We emphasize the importance of considering theses quantitiesespecially when the metallicity is derived for these types of systems.

Interaction effects on galaxy pairs with Gemini/GMOS- I: Electron density