The VUV spectroscopy of deuterated hydrazine, N2D4

Ab initio calculation of the electronic spectrum and ionization potentials of hydrazine

“…Compared to the first results obtained by Schiirgers and Welge [2], the spectrum published by Syage et al shows three more poorly defined shoulders at 218 and 178 nm and 155 nm. A similar spectrum was obtained by Hopkirk et al [12] for the isotopic compound N2D 4 using synchrotron radiation. The assignment of the electronic spectrum of N2H 4 proposed by Robin [13] underlines the Rydberg nature of the lowest lying electronic states.…”

“…Our Mulliken population analysis agrees with this intensity criterion. Moreover, our calculations do not predict any overlapping between Rydberg and valence cr * ,--n transitions as assumed by Hopkirk [12] in order to explain the broad unstructured nature of the electronic spectrum of N2D 4. On the other hand, our results imply that the 3d R ~ n+ and 3d R n_ as well 4s R *-n+ and 4s R ~ n_ are expected above 7.3 eV, much below the range where the f'n-st valence transitions appear (10.43 eV).…”

Systematic investigation of CO2 : NH3 ice mixtures using mid-IR and VUV spectroscopy – part 2: electron irradiation and thermal processing

“…[29][30][31][32] with a desorption temperature between 155-172 K. 30,32,33 The gas-phase VUV spectra of N 2 H 4 and N 2 D 4 are characterised by three absorption peaks with maxima near 144 nm, 168 nm & 194 nm. 34,35 The three absorption peak maxima in Fig. 8b are at 129 nm, 152 nm & 176 nm, which may represent these the N 2 H 4 bands since a shi in the absorption peaks from the gas phase to the solid phase is common.…”

Photochemical oxidative addition of hydrazinium cations to tetracyanoplatinate(II) induced by OSCT excitation

“…The lowest-energy transitions of hydrazine are of the nr * and rr * type involving promotions from the lone pairs at the nitrogen atoms and N-N r-bonding pair, respectively, to the N-N r * orbital [10]. The longest-wavelength absorption appear at k max = 194 nm.…”

“…Addition of diluted acids does not change this spectrum nor does it affect the thermal or photochemical stability of [Pt(CN) 4 ] 2À . Hydrazine is essentially transparent above 200 nm [10]. Protonation is expected to shift the VUV absorptions of N 2 H 4 to even shorter wavelength (see below).…”