A complete mass spectral fragmentation pattern of naturally abundant pentagermane is presented together with the parent mass spectrum of hexagermane. The mass spectrum of pentagermane shows a fragmentation pattern of the five different types of ions with the following relative order of intensities: M3> M4> M2> M5> M1. The base peak of pentagermane lies at m/e 222 in the Ge3Hx=0→8+region and not in the parent region. The base peak of hexagermane in the parent region lies at m/e 440. The precise centers of the three metastable regions of pentagermane lie at m/e 95.51, m/e 165.55 and m/e 237.47 respectively.