The photochemistry of ammonia in the Jovian atmosphere

Prasad, S. S.; Capone, L. A.

doi:10.1029/ja081i031p05596

Cited by 23 publications

(3 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An important motivation for the present work is astrophysical: ammonia is found in comets, interstellar space, and planetary atmospheres [37][38][39]. Spectroscopic studies of NH 3 and related molecules lead to new understanding of these environments.…”

Section: Introductionmentioning

confidence: 99%

Ab initio potential energy surface, electric-dipole moment, polarizability tensor, and theoretical rovibrational spectra in the electronic ground state of

et al. 2008

View full text Add to dashboard Cite

We report the calculation of a six-dimensional CCSD(T)/aug-cc-pVQZ potential energy surface for the electronic ground state of NH þ 3 together with the corresponding CCSD(T)/aug-cc-pVTZ dipole moment and polarizability surface of 14 NH þ 3 . These electronic properties have been computed on a large grid of molecular geometries. A number of newly calculated band centers are presented along with the associated electric-dipole transition moments. We further report the first calculation of vibrational matrix elements of the polarizability tensor components for 14 NH þ 3 ; these matrix elements determine the intensities of Raman transitions. In addition, the rovibrational absorption spectra of the m 2 , m 3 , m 4 , 2m 2 À m 2 , and m 2 þ m 3 À m 2 bands have been simulated.

show abstract

Section: Introductionmentioning

confidence: 99%

Ab initio potential energy surface, electric-dipole moment, polarizability tensor, and theoretical rovibrational spectra in the electronic ground state of

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Ammonia is also recognized as an astrophysical molecule, which has been found to exist in primitive planetary atmospheres, comets, and interstellar space. [1][2][3][4] Partly for this reason, NH 3 has been the subject of many previous photoionization and photoelectron measurements, [5][6][7][8][9][10][11][12][13][14][15] which have provided valuable energetic and spectroscopic information for NH 3 and its cation NH 3 + . From an experimental point of view, the relatively large rotational constants ͑Ϸ10 cm −1 ͒ of both NH 3 and NH 3 + represent an advantage, 11,16,17 making it easier to obtain fully rovibrationally resolved transitions in photoionization and photoelectron studies.…”

Section: Introductionmentioning

confidence: 99%

A two-color infrared-vacuum ultraviolet laser pulsed field ionization photoelectron study of NH3

Bahng

Xing

Baek

et al. 2005

The Journal of Chemical Physics

View full text Add to dashboard Cite

We have observed fully rotationally resolved transitions of the photoelectron vibrational bands 2(4), 2(5), 1(1)2(1), and 1(1)2(3) for ammonia cation (NH3+) by two-color infrared (IR)-vacuum ultraviolet (VUV)- pulsed field-ionization photoelectron (PFI-PE) measurements. By preparing an intermediate rovibrational state of neutral NH(3) with a known parity by IR excitation followed by VUV-PFI-PE measurements, we show that the photoelectron parity can be determined unambiguously. The IR-VUV-PFI-PE measurement of the 2(4) band clearly reveals the formation of both even and odd l states for the photoelectrons, where l is the orbital angular momentum quantum number. This observation is consistent with the conclusion that the lack of inversion symmetry for NH3 and NH3+ allows odd/even l mixings, rendering the production of both odd and even l states for the photoelectrons. Evidence is also found, indicating that the photoionization transitions with DeltaK=0 are strongly favored compared to that with DeltaK=3. For the 2(5), 1(1)2(1), and 1(1)2(3) bands, only DeltaK=0 transitions for the production of even l photoelectron states from the J'K'=2(0) rotational level of NH3(nu1=1) are observed. The preferential formation of even l photoelectron states for these vibrational bands is attributed to the fact that the DeltaK=0 transitions for the formation of odd l photoelectron states from the 2(0) rotational level of NH3(nu1=1) are suppressed by the constraint of nuclear-spin statistics. In addition to information obtained on the photoionization dynamics of NH3, this experiment also provides a more precise value of 3232+/-10 cm-1 for the nu1+ (N-H stretch) vibrational frequency of NH3+.

show abstract

“…It is interesting to note, that photodissociation of isolated NH 3 requires an energy of around 6.4 eV . This is far beyond the photon energies used above and usually takes place in Jovian's atmosphere only . In the hybrid semiconductor molecular orbitals from

{CH}_{3} {NH}_{3}^{+}

form energy bands, which reside deep in the valence and conduction bands.…”

Section: Perovskite Degradationmentioning

confidence: 99%

Influence of Radiation on the Properties and the Stability of Hybrid Perovskites

et al. 2017

View full text Add to dashboard Cite

Organic-inorganic perovskites are well suited for optoelectronic applications. In particular, perovskite single and perovskite tandem solar cells with silicon are close to their market entry. Despite their swift rise in efficiency to more than 21%, solar cell lifetimes are way below the needed 25 years. In fact, comparison of the time when the device performance has degraded to 80% of its initial value (T lifetime) of numerous solar cells throughout the literature reveals a strongly reduced stability under illumination. Herein, the various detrimental effects are discussed. Most notably, moisture- and heat-related degradation can be mitigated easily by now. Recently, however, several photoinduced degradation mechanisms have been observed. Under illumination, mixed perovskites tend to phase segregate, while, further, oxygen catalyzes deprotonation of the organic cations. Additionally, during illumination photogenerated charge can be trapped in the NH antibonding orbitals causing dissociation of the organic cation. On the other hand, organic-inorganic perovskites exhibit a high radiation hardness that is superior to crystalline silicon. Here, the proposed degradation mechanisms reported in the literature are thoroughly reviewed and the microscopic mechanisms and their implications for solar cells are discussed.

show abstract

The photochemistry of ammonia in the Jovian atmosphere

Cited by 23 publications

References 21 publications

Ab initio potential energy surface, electric-dipole moment, polarizability tensor, and theoretical rovibrational spectra in the electronic ground state of

Ab initio potential energy surface, electric-dipole moment, polarizability tensor, and theoretical rovibrational spectra in the electronic ground state of

A two-color infrared-vacuum ultraviolet laser pulsed field ionization photoelectron study of NH3

Influence of Radiation on the Properties and the Stability of Hybrid Perovskites

Contact Info

Product

Resources

About