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11

Electronic Resource

The low-lying electronic states of CoF (1996)

Ram, R. S. ; Bernath, P. F. ; Davis, S. P.

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 104 (1996), S. 6949-6955

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ISSN: 1089-7690

Source: AIP Digital Archive

Topics: Physics , Chemistry and Pharmacology

Notes: The emission spectrum of CoF has been investigated in the 820 nm–3.5 μm spectral region using a Fourier transform spectrometer. The bands were excited in a carbon tube furnace by the reaction of cobalt metal vapor and CF4 at a temperature of about 2300 °C. The bands observed in the 3000–9000 cm−1 region have been classified into three new transitions. The bands with 0-0 R-heads at 3458 cm−1, 3759 cm−1, and 4012 cm−1 have been assigned as the 3Δ1–3Φ2, 3Δ2–3Φ3, and 3Δ3–3Φ4 subbands of the C 3Δ–X 3Φi electronic transition. To higher wave numbers, two bands with R-heads at 8396 cm−1 and 8565 cm−1 have been assigned as the 3Δ2–3Φ3 and 3Δ3–3Φ4 subbands of the D 3Δ–X 3Φi transition. In addition, the bands with R-heads at 6339 cm−1 and 6542 cm−1 have been assigned as the 0-0 3Φ4–3Δ3 and 3Φ3–3Δ2 subbands of the G 3Φ–C 3Δ transition. The G 3Φ–X 3Φ transition has been reported previously as the [10.3]3Φ–X 3Φ transition. The rotational analysis of many bands of these transitions has been obtained and the molecular constants for the two new low-lying excited states have been extracted. Six new band involving the high vibrational levels of ground state (up to v=6) have been identified in the 3Φ4–3Φ4 subband of the G 3Φ–X 3Φ transition. The rotational analysis of these bands provides improved constants for the ground state. We have noticed, as have previous workers, the strong correspondence that exists between the states of transition metal monofluorides and monohydrides. In addition, all of the low-lying states of CoF and CoH are related to the low-lying terms of the Co+ atom. We discuss these correlations between the energy levels of CoF, CoH, and Co+. © 1996 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.471411

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12

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Fourier transform emission spectroscopy of new infrared systems of LaH and LaD (1996)

Ram, R. S. ; Bernath, P. F.

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 104 (1996), S. 6444-6451

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ISSN: 1089-7690

Source: AIP Digital Archive

Topics: Physics , Chemistry and Pharmacology

Notes: The electronic emission spectra of LaH and LaD have been investigated in the 3 μm–700 nm spectral region using a Fourier transform spectrometer. The molecules were excited in a lanthanum hollow cathode lamp operated with neon gas and a trace of hydrogen or deuterium. The bands observed in the 1 μm–3 μm region have been assigned into two new electronic transitions; A 1Π–X 1Σ+ and d 3Φ–a 3Δ. The LaH bands with origins at 4533.5593(8) cm−1 and 4430.1916(13) cm−1 have been assigned as the 0-0 and 1-1 bands of the A1Π–X 1Σ+ transition. The rotational analysis of these bands provides the following principal molecular constants for the ground X 1Σ+ state, Be=4.080 534(80) cm−1 and αe=0.077 39(10) cm−1 and re=2.031 969(20) A(ring). To higher wave numbers, three subbands of LaH with origins at 5955.8568(16) cm−1, 6238.3768(8) cm−1, and 6306.6757(15) cm−1 have been assigned as the 3Φ2–3Δ1, 3Φ3–3Δ2, and 3Φ4–3Δ3 subbands of the d 3Φ–a 3Δ electronic transition. The rotational analysis of the 0-0 and 1-1 bands of the 3Φ2–3Δ1 and 3Φ4–3Δ3 subbands and the 0-0, 1-1, and 2-2 bands of the 3Φ3–3Δ2 subband has been obtained and effective equilibrium constants for the spin components of the d 3Φ and the a 3Δ states have been extracted. Magnetic hyperfine structure was also observed in the a 3Δ state. The rotational analysis of the corresponding LaD transitions has also been carried out and equilibrium constants for the ground and excited states have been determined. The singlet–triplet interval between the X 1Σ+ state and the a 3Δ state is not known but on the basis of ab initio calculation and by comparison with LaF and YH, we believe that the ground state of LaH is a 1Σ+ state. © 1996 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.471365

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13

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Gas-phase inorganic chemistry: laser spectroscopy of calcium and strontium monothiolates and monohydrosulfides (1991)

Fernando, W. T. M. L. ; Ram, R. S. ; O'Brien, L. C. ; [et al.]

s.l. : American Chemical Society

The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 2665-2668

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Source: ACS Legacy Archives

Topics: Chemistry and Pharmacology , Physics

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1021/j100160a009

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14

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Fourier transform emission spectroscopy of ScN (1992)

Ram, R. S. ; Bernath, P. F.

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 96 (1992), S. 6344-6347

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ISSN: 1089-7690

Source: AIP Digital Archive

Topics: Physics , Chemistry and Pharmacology

Notes: The near-infrared electronic emission spectrum of ScN has been observed in the 1.6–1.8 μm spectral region using a Fourier transform spectrometer. The three bands with origins at 5820.0944(5), 6051.2858(20), and 6266.1290(13) cm−1 have been assigned as the 0-0, 1-1, and 2-2 bands of the A 1Σ+−X 1Σ+ electronic transition. The principal equilibrium molecular constants for the ground state obtained from a fit of the observed lines are B‘e=0.554 609(17) cm−1, r‘e=1.687 23(3) A(ring) and the corresponding values for the excited state are B'e=0.549 277(17) cm−1, re=1.695 40(3) A(ring). Although ScN is a well-known refractory solid, our work is the first observation of the gas-phase ScN molecule.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.462628

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15

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A quasi-steady state integral model for border irrigation (1986)

Ram, R. S. ; Singh, V. P. ; Prasad, S. N.

Springer

Irrigation science 7 (1986), S. 113-141

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ISSN: 1432-1319

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Summary A quasi-steady state integral (QSSI) model was developed for irrigation on freely draining borders. A semi-analytical method was used for solving the governing equations. The model results compared favorably with experimental data from 13 experimental borders for advance and from 4 experimental borders for recession. The absolute average percent deviation (APD) between calculated and observed advance times varied between 13.1 and 26.6 for 4 data sets and between 9.2 and 18.8 for 9 data sets. The APD for recession times varied between 1.7 and 5.7 for 4 data sets. The calculated advance times were smaller than observed values for these borders. For constant infiltration parameters, the border bed roughness was found to be the single most important parameter affecting model results.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00259428

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16

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Quantitative studies on the mating system of opium poppy (Papaver somniferum L.) (1992)

Patra, N. K. ; Ram, R. S. ; Chauhan, S. P. ; [et al.]

Springer

Theoretical and applied genetics 84 (1992), S. 299-302

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ISSN: 1432-2242

Keywords: Papaver somniferum ; Outcrossing rate ; Selfing rate ; Mating system

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary Nearly 400 individuals at two locations and over a number of years were crossed and subsequently scored for selfing versus outcrossing in eight monohybrid populations of opium poppy (Papaver somniferum). Two different marker loci, petal colour (R/r) and capsule size (B/b) were used to determine the male gametes that had effected fertilizations in F2 recessives (rr and bb). The estimates of the outcrossing parameter α were found to vary with year, location and for the marker locus used (α range: 0.0988–0.3704). Study of two dihybrid crosses involving the two loci simultaneously, further confirmed that outcrossing at the R/r locus was significantly greater than that at the B/b locus. The nature of the outcrossing was, in general, nonrandom. Selfmg predominated in this species; however, there was a high frequency of natural outcrossing for generating variations in P. somniferum.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00229486

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17

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Potential of gamma radiation enhancing the biosynthesis of tropane alkaloids in black henbane (Hyoscyamus niger L.) (1989)

Sharma, J. R. ; Lal, R. K. ; Misra, H. O. ; [et al.]

Springer

Euphytica 40 (1989), S. 253-258

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ISSN: 1573-5060

Keywords: Hyoscyamus niger ; black henbane ; mutation breeding ; genetic improvement ; tropane alkaloids

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Summary A productive yellow flowered mutant with high tropane alkaloid content was isolated in the M2 generation of gamma irradiated (Co60 at 40 kr) progenies ofHyoscyamus niger. Mutant progenies, on an average, were capable of synthetising more than twice crude alkaloid (0.147% to 0.221%) in M3 through M6 generations compared to the parental control (0.065 to 0.106%). In pilot scale trial (M7), two elite lines, Y-15 and Y-17 were found to contain 0.390% and 0.318% crude drug in contrast to 0.211% in an improved inbred used as control. However, owing to conducive plant morphology, Y-17 registered high yield of dry biomass, hence gave more than double yield of crude drug than the improved control (inbred) (23 kg/ha against 11 kg/ha). Also being superior in hyoscyamine and hyoscine yields, it was redesignated as var.Aela, and released for commercial cultivation in India, thus signifying the efficiency of radiation breeding for crop improvement.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00024520

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