The Microwave Spectrum of Ketene

Preparation and the Microwave and Infrared Spectra of Vinyl Ketene

Vinyl ke t ene (1 ,3-butadienel -one) has been synthesized b y v a c u u m pyrolysis of 3-butenoic 2-butenoic a n h y d r i d e . The microwave and inf rared spectra of v inyl ke tene in t h e gas phase a t room t e m p e r a t u r e h a v e been s tudied. The f rans ro tamer has been identif ied, a n d t h e spectroscopic cons t an t s were found t o be A = 39571(48) MHz, B = 2392.9252(28) MHz...

The microwave spectrum of neurotransmitter serotonin.

A laser ablation device in combination with a molecular beam Fourier-transform microwave spectrometer has allowed the observation of the rotational spectrum of serotonin for the first time. Three conformers of the neurotransmitter have been detected and characterized in the 4-10 GHz frequency range. The complicated hyperfine structure arising from the presence of two (14)N nuclei has been fully...

Microwave Spectrum of y-Thiobutyrolactone

The microwave spectrum of y-thiobutyrolactone has been observed and measured in the vibrational ground state and in several excited states of the ring-bending and ring-twisting modes. From the value of the /ic component of the dipole moment and inertial-defect considerations the ring skeleton was shown to be non-planar. The average intensity ratio for the rotational transitions between the grou...

THE CMB SPECTRUM Cosmic Microwave Background

The observed cosmic microwave background (CMB) radiation provides strong evidence for the hot big bang. The success of primordial nucleosynthesis calculations (“Big-bang nucleosynthesis”) requires a cosmic background radiation (CBR) characterized by a temperature kT ∼ 1MeV at a redshift of z ≃ 109. In their pioneering work, Gamow, Alpher, and Herman[2] realized this and predicted the existence ...

Microwave spectrum and molecular structure of PNO