Showing papers by "Richard J. Saykally published in 1981"
87 citations
TL;DR: In this paper, the first microwave structure for any molecular ion was determined using the Doppler shifts of the HCO+ frequency due to ion drift in a dc discharge and a measurement of the J = 1→2 transition of DCO+, and thus its centrifugal distortion constant, are also reported.
Abstract: Precise measurements of the frequencies of the J = 0–1 transition of HCO+, H13CO+, HC18O+, DCO+, D13CO+, and DC18O+ have been used to determine a substitution (rs) molecular structure for HCO+. The bond distances obtained are rs(CO) = 1.1071(2) A and rs(CH) = 1.0930(1) A. This is the first such microwave rs structure to be determined for any molecular ion. The determined bond distances and the transition frequencies can be compared to the results of previous high quality ab initio calculations and excellent agreement is found. An initial attempt to characterize the Doppler shifts of the HCO+ frequency due to ion drift in a dc discharge and a measurement of the J = 1→2 transition of DCO+, and thus its centrifugal distortion constant, are also reported here.
58 citations
TL;DR: In this paper, the zero-field frequencies of the oxygen molecule 16O16O in its metastable state, a1Δg, v = 0, were obtained using six fir laser lines, where B0 = 42.50457(10) GHz, D0 = 153.14(110) kHz and q = 0.050(90) kHz.
24 citations
TL;DR: In this article, microwave observations of the J = 0-1 transitions of N2H+, 15N2H+ and 15N14ND+ have been used to determine a substitution structure for N 2H+.
Abstract: Microwave observations of the J = 0–1 transitions of N2H+, 15N2H+,and 15N14ND+, N2D+, 15N2D+, and 15N14NH+ have been used to determine a substitution structure for N2H+. The resultant structural parameters are rs(NN) = 1.0947(4) A and rs(NH) = 1.0320(1) A, which agree beautifully with those from available ab initio calculations. The frequencies obtained for the 15N species provide a basis for their future radioastronomical detection and identification.
22 citations
01 Jan 1981
TL;DR: In this article, strong infrared optogalvanic signals have been observed in the region from 3600-4100 cm−1 for H, He, Li, Ne, and Ar excited in hollow cathode discharges as a result of transitions induced among low Rydberg states of the atoms by a cw F-center laser.
Abstract: Strong infrared optogalvanic signals have been observed in the region from 3600–4100 cm−1 for H, He, Li, Ne, and Ar excited in hollow cathode discharges as a result of transitions induced among low Rydberg states of the atoms by a cw F-center laser. On the order of fifty transitions have been assigned in both neon and argon, eleven in helium, and one each in lithium and hydrogen. Studies of the quenching of helium and neon optogalvanic signals by the addition of hydrogen, deuterium and nitrogen to the inert gas plasmas indicate that a quasi-resonant process is occurring for the quenching of helium n = 4 → 6 transitions by H2. The high signal-to-noise ratios observed for many of these transitions with only a few milliwatts of laser power illustrates the potential of this technique for studying excited states of atoms and molecules in plasma environments and suggests the use of atomic Rydberg optogalvanic spectra for frequency calibration in the infrared.