A comprehensive study of glycolaldehyde (CH2OHCHO) has been conducted at 2 and 3 mm toward Sgr B2(N) using the Arizona Radio Observatory 12 m telescope. Forty favorable transitions this species were observed in range 68-169 GHz. Emission on 20-70 mK level was detected frequencies 38 these lines, including all arising from Ka = 0, 1, ladders. The two not weak originate less populated levels. Twenty-one percent lines are distinct, individual features. remaining either contaminated by emission...

Extensive observations of acetamide (CH3CONH2) and formamide (NH2CHO) have been conducted toward Sgr B2(N) at 1, 2, 3 mm using the Submillimeter Telescope (SMT) 12 m antenna Arizona Radio Observatory. Over frequency range 65–280 GHz, 132 transitions observed as individual, distinguishable features, although in some cases they are partially blended. The unblended indicate VLSR = 63.2 ± 2.8 km s−1 ΔV1/2 12.5 2.9 s−1, line parameters that very similar to other organic species B2(N). For...

The CCP radical (X2Πr) has been detected in the circumstellar gas of IRC +10216, fifth phosphorus-bearing molecule identified interstellar space. This identification was made on basis new laboratory millimeter/submillimeter direct absorption measurements, conducted range 120-413 GHz. Four rotational transitions this species were observed using Arizona Radio Observatory (ARO) 12 m telescope Kitt Peak at 2 and 3 mm wavelength. Each transition consists lambda-doublets, which are well-separated...

Millimeter-wave observations of PN, CP, and HCP have been carried out toward circumstellar envelopes evolved stars using the Arizona Radio Observatory (ARO). PN identified in carbon-rich source CRL 2688 via at 1 mm Submillimeter Telescope (SMT) 2-3 with Kitt Peak 12 m. An identical set measurements were IRC +10216, as well CP mm. was also observed VY Canis Majoris (VY CMa), an oxygen-rich supergiant star. The line profiles +10216 are roughly flat topped, indicating unresolved, optically thin...

A new interstellar molecule, FeCN (X4Δi), has been detected in the envelope of carbon-rich asymptotic giant branch star, IRC+10216. This work is first definitive detection an iron-bearing molecule medium and based on newly measured rest frequencies. Eight successive rotational transitions this linear free radical lowest spin ladder, Ω = 7/2, were observed at 2 3 mm using Arizona Radio Observatory (ARO) 12 m telescope. Three appear as single, unblended features 1–2 mK level exhibit...

A new interstellar molecule, CH3NCO (methyl isocyanate), has been detected using the 12 m telescope of Arizona Radio Observatory (ARO). was identified in spectra covering 48 GHz (68–116 GHz) 3 mm segment a broadband survey Sgr B2(N). Thirty very favorable rotational lines (Ka = 0 and Ka 1 only; Eu < 60 K) originating five consecutive transitions (J 8 7, 9 8, 10 9, 11 10, 11) both E internal rotation species are present this frequency range. Emission observed at all predicted frequencies,...

A new interstellar molecule, HSCN (thiocyanic acid), an energetic isomer of the well-known species HNCS, has been detected toward Sgr B2(N) with Arizona Radio Observatory 12 m telescope. Eight rotational transitions in Ka = 0 ladder were observed 2 mm and 3 bands. Five consecutive band are unblended, but three partially masked by lines other molecules. The peak intensity all eight well described a temperature that is very good agreement many molecules this source. line width radial velocity...

Multiple observations of methanimine (CH2NH) and methyl amine (CH3NH2) have been performed toward Sgr B2(N) at 1, 2, 3 mm using the Submillimeter Telescope 12 m antenna Arizona Radio Observatory. In frequency range 68–280 GHz, 23 transitions CH2NH 170 lines CH3NH2 observed as individual, distinguishable features, although some are partially blended with other lines. For CH2NH, line profiles indicate VLSR = 64.2 ± 1.4 km s−1 ΔV1/2 13.8 2.8 s−1, while 63.7 1.6 15.1 3.0 for CH3NH2, parameters...

The pure rotational spectrum of CuCCH in its ground electronic state (X̃ Σ1+) has been measured the frequency range 7–305 GHz using Fourier transform microwave (FTMW) and direct absorption millimeter/submillimeter methods. This work is first spectroscopic study CuCCH, a model system for copper acetylides. molecule was synthesized new technique, discharge assisted laser ablation spectroscopy (DALAS). Four to five transitions were this species six isotopologues (C63uCCH, C65uCCH, C63uC13CH,...

Millimeter observations of isothiocyanic acid (HNCS) and its higher energy isomer, thiocyanic (HSCN), have been carried out toward Sgr B2 TMC-1 using the 12 m telescope Arizona Radio Observatory. For both species, JKa,Kc = 80,8 → 70,7 90,9 transitions near 91–93 GHz 103–106 were mapped across a 6' × 3' region, centered B2(M). Comparative mapping also done for 40,4 30,3 line HNCO HOCN 84–87 GHz. In addition, 60,6 HNCS HSCN detected in TMC-1, first identification either molecule cold, dark...

Curiouser and curiouser: By combining high-resolution molecular spectroscopy in the centimeter millimeter wave regions, high-level coupled-cluster quantum-chemical calculations, structure of HPSi molecule has been determined. The bridged geometry is remarkable contrast to that C and/or N analogues, such as HCN/HNC, HCP, HNSi, which are all linear. Detailed facts importance specialist readers published "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset....

Abstract A study has been conducted of 12 C/ 13 C ratios in five complex molecules the Galactic center. H 2 CS, CH 3 CCH, NH CHO, CHCN, and CN their C-substituted species have observed numerous transitions at 1, 2, mm, acquired a spectral-line survey Sgr B2(N), with telescopes Arizona Radio Observatory (ARO). Between 22 54 individual, unblended lines for 2–54 analogs were modeled global radiative transfer analysis. All found to consistently exhibit two velocity components near V LSR ∼ 64 73...

Mapping observations of the J = 6 → 5 transition N2O and Π, 3/2 1/2 line NO in 2 mm band toward core region Sagittarius B2 complex have been carried out using Kitt Peak 12 m telescope. Emission from was found to be extended over a 2' × 5' size that includes Sgr (N), (M), (OH) positions, very similar distribution for HNO. In contrast, emission confined source approximately 1' extent, slightly elongated north-south direction centered on (N) core. A virtually identical JKτ 140 14-1 E methanol,...

A search for confirming transitions of 1,3-dihydroxyacetone, (CH2OH)2CO (hereafter DHA), has been made toward Sgr B2(N) using the Arizona Radio Observatory Submillimeter Telescope (SMT) and 12 m telescope at millimeter wavelengths. In addition, data this species have obtained Green Bank Telescope. all, 63 new DHA were sought; no plausible emission was detected 97% these frequencies. Typical peak-to-peak limits 10-30 mK achieved, indicating that is not present in level reported by Widicus...

The pure rotational spectrum of HPS, as well its (34)S and D isotopologues, has been recorded at microwave, millimeter, submillimeter wavelengths, the first observation this molecule in gas phase. data were obtained using a combination millimeter direct absorption, Fourier transform microwave (FTMW), microwave-microwave double-resonance techniques, which cover total frequency range from 15 to 419 GHz. Quantum chemical calculations B3LYP CCSD(T) levels also performed aid spectral...

A combined laboratory and astronomical investigation has been conducted on the methyl sugar hydroxyacetone (CH3COCH2OH). Rotational transitions of this species in ground torsional state (vt = 0) were recorded using both millimeter-wave direct absorption techniques Fourier transform microwave spectroscopy. total 1145 lines CH3COCH2OH analyzed frequency range 4 to 180 GHz, including arising from A- E-symmetry species. modified rho-axis method Hamiltonian was needed for analysis because...

The pure rotational spectrum of CCP (X (2)Pi(r)) has been measured at microwave, millimeter, and submillimeter wavelengths (17-545 GHz), along with its (13)C isotopologues ((13)C(13)CP, C(13)CP, (13)CCP). spectra these species were recorded using a combination millimeter/submillimeter direct absorption methods Fourier transform microwave (FTMW) techniques. phosphorus dicarbides created in the gas phase from reaction red acetylene or methane argon an ac discharge for experiments, PCl(3) as...

Rate constants (kij) measured by stopped flow are reported for 50 additional intermolecular electron transfer reactions between 0 and 1+ oxidation states of various compounds, enlarging our data set to 141 45 couples in acetonitrile containing 0.1 M tetrabutylammonium perchlorate at 25 °C. Hydrazines with both saturated unsaturated substituents, ferrocene derivatives, heteroatom-substituted aromatic compounds included the studied. Least-squares fit all simple Marcus cross-reaction theory...

The most-studied organocopper, methylcopper (CH3Cu), has been synthesized for the first time as a monomer, free of other ligands or coordinated solvent, and detected using millimeter-wave rotational spectroscopy. molecule was created in gas phase by reaction copper vapor several different precursors, including CH4 tetramethylsilane. An obvious symmetric top pattern observed, indicative C3v symmetry. For confirmation, spectra four isotopically substituted species, 65Cu12CH3, 63Cu12CD3,...

The J = 2 ← 1 and 3 rotational transitions of AlD (X1Σ+) near 393 590 GHz have been measured using submillimeter direct absorption spectroscopy. was created in an AC discharge Al(CH3)3 D2 the presence argon. This work is first measurement transition AlD. Each found to be split into multiple hyperfine components due 27Al nuclear spin I 5/2, some which are blended together. data for were fit with effective Hamiltonian rotational, electric quadrupole, spin-rotation constants determined...

Six electronic states (X 4Σ−, A 4Π, B 4Δ, 2Φ, 2Δ, 2Σ+) of the vanadium monochloride cation (VCl+) are described using large basis set coupled cluster theory. For two lowest quartet 4Σ− and 4Π), a focal point analysis (FPA) approach was used that conjoined correlation-consistent family sets up to aug-cc-pwCV5Z-DK with high-order theory through pentuple (CCSDTQP) excitations. FPA adiabatic excitation energies (T0) spectroscopic constants (re, r0, Be, B0, $\bar D$D¯e, He, ωe, v0, αe, ωexe) were...

The pure rotational spectrum of the SrSH radical in its ground electronic (X̃ 2A′) and vibrational states has been measured using millimeter/submillimeter-wave direct absorption techniques. This work is first observation with resolution. deuterium isotopomer SrSD SrS (X 1Σ+) recorded as well. These species were created by reaction strontium vapor H2S, presence a dc discharge. was also made CS2. For SrSD, eight transitions recorded, respectively, for which asymmetry components up to Ka=8...

The J = 0 → 1 transition of AlH at 377 GHz and the 2 line AlD 393 have been recorded using submillimeter direct absorption methods. two species were created by reaction aluminum vapor H2 or D2 gas in a DC discharge. 27Al quadrupole hyperfine splittings, which are critical for astronomical identification these molecules, measured both AlD. In case AlH, observed pattern was not consistent with previous measurements. Values parameters thus revised to be eQq -48.59 MHz CI 0.306 MHz, agree very...

The calcium carbide radical, CaC, has been observed in the laboratory for first time using millimeter/submillimeter direct absorption spectroscopy. species was created gas phase by reaction of vapor and methane under extreme DC discharge conditions. Eleven rotational transitions CaC its X3Σ- ground state were recorded frequency range 247-536 GHz. Each transition found to consist triplets due fine-structure interactions that indicate is 3Σ-, as opposed 5Σ-, both which have suggested theory....