Isoquinoline gas-phase absorption spectrum in the vacuum ultraviolet between 3.7 and 10.7 eV. New valence and Rydberg electronic states.

VUV photons from a synchrotron source were used to record the gas-phase absorption spectrum of isoquinoline over the range 3.5 to 10.7 eV.

VUV Absorption Spectra of Gas-Phase Quinoline in the 3.5-10.7 eV Photon Energy Range.

The absorption spectrum of quinoline was measured in the gas phase between 3.5 and 10.7 eV using a synchrotron photon source.

Survival and DNA Damage in Plant Seeds Exposed for 558 and 682 Days outside the International Space Station.

For life to survive outside the biosphere, it must be protected from UV light and other radiation by exterior shielding or through sufficient inherent resistance to survive without protection. We tested the plausibility of inherent resistance in plant seeds, reporting in a previous paper that Arabidopsis thaliana and tobacco (Nicotiana tabacum) seeds exposed for 558 days outside the International Space Station (ISS) germinated and developed into fertile plants after return to Earth. We have now measured structural genetic damage in tobacco seeds from this EXPOSE-E experiment by quantitatively amplifying a segment of an antibiotic resistance gene, nptII, inserted into the chloroplast genome.

Size effects on cation heats of formation. III. Methyl and ethyl substitutions in group IV XH₄, X = C, Si, Ge, Sn, Pb.

The heats of formation of alkyl-substituted XH4 (X = C, Si, Ge, Sn, Pb) ΔfH(M(+)) = IEad(M) + ΔfH (M) molecular ions have often never been measured or are not known to better than 10 or 20 kJ/mol. The present study on these Main Group IV compounds adopts a graphical approach that relates cation heats of formation to cation size. A study of methyl substitution in XH4 is followed by a similar examination of heat of formation data on ethyl substitution in methane, silane, germane, stannane, and plumbane.

Ionization photophysics and spectroscopy of cyanoacetylene.

Photoionization of cyanoacetylene was studied using synchrotron radiation over the non-dissociative ionization excitation range 11-15.6 eV, with photoelectron-photoion coincidence techniques. The absolute ionization cross-section and spectroscopic aspects of the parent ion were recorded.

Ionization photophysics and spectroscopy of dicyanoacetylene.

Photoionization of dicyanoacetylene was studied using synchrotron radiation over the excitation range 8-25 eV, with photoelectron-photoion coincidence techniques. The absolute ionization cross-section and detailed spectroscopic aspects of the parent ion were recorded. The adiabatic ionization energy of dicyanoacetylene was measured as 11.

Size effects on cation heats of formation. II. Methyl substitutions in oxygen compounds.

A relation between the heat of formation of molecular ions and cation size is used to study the effects of methyl substitution on a series of species containing oxygen. These include methanol, the hydroxymethyl radical, formaldehyde and related isomers, acetaldehyde and related isomers, ketene, formic acid, and acetic acid. This size-dependent relation is found to be valid in most cases, enabling a choice to be made among conflicting reported ion and neutral heat of formation values, but it holds much less well in methyl-substituted formaldehyde and its carbene isomers.

Survival of plant seeds, their UV screens, and nptII DNA for 18 months outside the International Space Station.

The plausibility that life was imported to Earth from elsewhere can be tested by subjecting life-forms to space travel. Ultraviolet light is the major liability in short-term exposures (Horneck et al., 2001 ), and plant seeds, tardigrades, and lichens-but not microorganisms and their spores-are candidates for long-term survival (Anikeeva et al.

Photoionization mass spectrometric study of the prebiotic species formamide in the 10-20 eV photon energy range.

A photoion mass spectrometry study of the prebiotic species formamide was carried out using synchrotron radiation over the photon energy range 10-20 eV. Photoion yield curves were measured for the parent ion and seven fragment ions. The ionization energy of formamide was determined as IE (1(2)A') = 10.

Do outcome measures for trauma triage agree?

Objective: The goal of trauma triage is to match resources to the needs of seriously injured patients. The trauma triage literature has used a variety of outcome measures to assess appropriate trauma activation. The objective of this study was to determine the agreement between procedural and nonprocedural outcome measures in a population of seriously injured patients transported to a single trauma center.

Monomeric azaheterofullerene derivatives RC59N: influence of the R moiety on spectroscopic and photophysical properties.

We have synthesised nine monomeric azaheterofullerene (AZA) derivatives, RC(59)N, with a wide variety of different side chains R and investigated their spectroscopic and photophysical properties in toluene and o-dichlorobenzene (ODCB). Measurements include their ground-state absorption spectra, molar absorption coefficient (epsilon(G)), fluorescence spectra, fluorescence quantum yields (Phi(F)), singlet-state lifetimes (tau(F)), triplet-state absorption spectra, triplet molar absorption coefficients (epsilon(T)), singlet oxygen (Phi(Delta)), and triplet state (Phi(T)) quantum yields. The replacement of a carbon by a nitrogen atom in the C(60) sphere strongly affects most of the spectroscopic and photophysical properties.

VUV photodissociation of ammonia: a dispersed fluorescence excitation spectral study.

NH2 and NH transitions were identified in dispersed fluorescence spectra obtained by VUV excitation of NH3 at nine different energies between 8.266 and 15.498 eV.